Known issues
Every known reason Luduvo won't start, join or stay open, built from forum reports and staff replies. Last checked 26 Sep 2026, against build 45.
Anything marked unconfirmed came from a player and nobody has confirmed it works yet. The log checker on the home page uses exactly this list.
Stops the game starting
- Luduvo bug Not fixed yet
Game won't start: D3D12 graphics error
“A popup says Luduvo failed to launch and to check client.log. Studio says the Client did not start.”
- Who gets it
- Windows
- What to try
- There's nothing you can fix on your end yet. Reinstalling drivers or Luduvo won't change this one.
- Staff
- “This will most likely be resolved in tomorrow's update, Luduvo 45. If it continues, please let us know.” Isaac, 24 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
AMD graphics driver crashes on Windows
“A black screen for a couple of seconds, then the window closes. No error popup.”
- Who gets it
- Windows with AMD graphics
- What to try
- There's nothing you can fix on Windows yet. Staff said on 23 Sep it'll be fixed by October.
- Staff
- “This will be resolved by October.” Isaac, 23 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Intel graphics blocked from Vulkan
“Luduvo fails to launch on a laptop with Intel UHD or HD graphics.”
- Who gets it
- Windows with Intel graphics
- What to try
- There's nothing you can fix on your end yet. A newer Intel driver doesn't take these chips off the list.
Full details · Last checked 26 Sep 2026.
- Your hardware Not fixed yet
Graphics only supports Vulkan 1.2
“Luduvo fails to launch on older graphics.”
- Who gets it
- Any system
- What to try
- Look for a newer graphics driver from your laptop maker or the chip maker's own site. A newer driver sometimes adds Vulkan 1.3. unconfirmed
- Staff
- “This is true.” Isaac, 23 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your hardware Not fixed yet
Graphics can't run D3D12 feature level 12.0
“A popup says: No compatible GPU found. Luduvo requires a compatible Vulkan 1.3/ Metal3/ D3D12 GPU or driver.”
- Who gets it
- Windows
- What to try
- Check for a newer graphics driver. On hardware this old there usually isn't one that helps.
- Staff
- “vulkan, dx12 and dx11 of which vulkan and dx12 are already in use” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your setup Not fixed yet
Vulkan found no graphics card
“Luduvo fails to launch on a laptop with two graphics chips.”
- Who gets it
- Windows
- What to try
- If you're on build 43 or older, update Luduvo. Build 44 falls back to D3D12 when this happens.
- Staff
- “will be fixed soon. The vulkan drivers lack certain features. The d3d12 backend will be enabled in the next update” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your setup Fixed in build 44
Broken Vulkan install stops the window opening
“Luduvo fails to launch straight away on builds 39 to 43.”
- Who gets it
- Windows
- What to try
- Update Luduvo to build 44 or newer. It switches to D3D12 when Vulkan is broken.
- Staff
- “vulkan drivers on windows are very buggy” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your setup Has a workaround
vulkan-1.dll was not found
“A Windows popup: The code execution cannot proceed because vulkan-1.dll was not found.”
- Who gets it
- Windows
- What to try
- Update your graphics driver from NVIDIA, AMD or Intel's own website, then restart your PC.
Full details · Last checked 26 Sep 2026.
- Your setup Has a workaround
A recorder or overlay crashes Luduvo
“The game closes at startup. crash.log names a file from another program's folder.”
- Who gets it
- Windows
- What to try
- Look at the crash line for the program's folder, for example Bandicam.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Fixed
Shader files missing
“Luduvo fails to launch after an update. Seen on launch day.”
- Who gets it
- Windows
- What to try
- Update Luduvo. This was a launch-day bug and hasn't turned up in build 44 logs.
- Staff
- “Some of you who previously installed or joined Luduvo were completely locked out due to a shader issue. This is our top priority” Isaac, 13 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Fixed in build 44
Non-Latin Windows username breaks the launcher
“Luduvo.exe opens in the background and closes after a few seconds.”
- Who gets it
- Windows
- What to try
- Update Luduvo to build 44 or newer. That build fixed the launcher for Cyrillic and other non-Latin usernames.
- Staff
- “The saga finally ends.” Isaac, 25 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Fixed in build 43
Mac download missing its Metal shaders
“The Mac client aborts straight away.”
- Who gets it
- macOS
- What to try
- Download Luduvo again from luduvo.com. Build 43 fixed the missing shaders.
- Staff
- “its fixed now” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your setup No word yet
Missing shared library on Linux
“Luduvo won't start and the terminal says it can't load a shared library.”
- Who gets it
- Linux
- What to try
- The missing file is named in the highlighted line. For libOpenGL.so.0, install your distro's libopengl0 package, for example sudo apt install libopengl0. unconfirmed
Full details · Last checked 26 Sep 2026.
Stops you joining
- Your setup Fixed in build 40
Corrupted content cache
“Luduvo won't update and keeps using old content.”
- Who gets it
- Windows
- What to try
- Close Luduvo completely.
- Staff
- “delete the appdata/Roaming/Luduvo completely it looks like its corrupted.” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Content folder can't be created under a non-Latin username
“The log warns it cannot create a content folder under your user profile.”
- Who gets it
- Windows
- What to try
- Update Luduvo first. Build 44 fixed a related launcher bug for non-Latin usernames.
Full details · Last checked 26 Sep 2026.
- Your network Not fixed yet
Launcher can't download updates
“Luduvo won't update, or starts an old version that can't join games.”
- Who gets it
- Any system
- What to try
- Try a different network, for example your phone's hotspot, with any VPN or proxy turned off.
- Staff
- “Is under investigation. Is a VPN in use?” IgorAlexey, 11 Jun 2026
Full details · Last checked 26 Sep 2026.
- Your network Not fixed yet
Disconnected: the connection broke
“You join a game and get "Disconnected: the connection broke" straight away.”
- Who gets it
- Any system
- What to try
- If you use a VPN, proxy or network filter, turn it off and try again.
Full details · Last checked 26 Sep 2026.
- Your network Not fixed yet
Can't connect to the game server
“The game loads, then never connects. Input and camera stop responding.”
- Who gets it
- Any system
- What to try
- Close Luduvo, refresh the game page in your browser and press Join again.
- Staff
- “did you refresh the brower page and launch the game again?” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
"Sign in again to play" on your own game
“Disconnected: Sign in again to play, every time you join a game you made.”
- Who gets it
- Any system
- What to try
- Post your client.log in the thread below. Nikhil said it's rare and hard to reproduce, so a log helps.
- Staff
- “pls share client.log this one is a rare problem and hard to reproduce” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your network Has a workaround
"Sign in again to play" from rate limiting
“Disconnected: Sign in again to play, or a message about strange activity.”
- Who gets it
- Any system
- What to try
- Wait about an hour, then try again.
- Staff
- “It's just you being ratelimited.” Isaac, 25 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your setup Has a workaround
"Sign in again to play" after starting the game by hand
“Disconnected: Sign in again to play, after pasting a launch link into Terminal.”
- Who gets it
- macOS
- What to try
- Press Join on the website again and start the game straight away.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Join does nothing on macOS
“The browser asks to open Luduvo URI Handler, then nothing happens.”
- Who gets it
- macOS
- What to try
- There's no simple fix yet. Studio works in the meantime.
- Staff
- “there are some issues with launching games on mac, but the studio should work fine” Nikhil, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Your hardware No word yet
Illegal instruction on an old CPU
“Event Viewer shows EXCEPTION_ILLEGAL_INSTRUCTION when you join a game.”
- Who gets it
- Windows
- What to try
- Note your CPU model (Settings, System, About).
Full details · Last checked 26 Sep 2026.
Crashes while playing
- Your setup Has a workaround
GPU blocklist override is switched on
“Someone followed the hint in the error message and switched the blocklist off.”
- Who gets it
- Windows
- What to try
- Search Windows for "Edit environment variables for your account" and open it.
Full details · Last checked 26 Sep 2026.
- Your hardware Not fixed yet
Graphics device lost after joining
“The game or the Studio viewport freezes. Windows may say it blocked LuduvoEditor.exe from accessing graphics hardware.”
- Who gets it
- Windows
- What to try
- If LDV_VK_SKIP_BLOCKLIST is set, remove it first. That's almost certainly the cause.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Renderer fails when the window resizes
“A Studio playtest stops rendering after the window is resized.”
- Who gets it
- Linux
- What to try
- Avoid resizing or maximising the window during a playtest for now. unconfirmed
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Console command crashes the game
“Typing a command into the F9 console closes the game.”
- Who gets it
- Any system
- What to try
- Avoid typing commands into the F9 console for now.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Luduvo itself crashed
“crash.log names LuduvoGame.exe or LuduvoEditor.exe.”
- Who gets it
- Windows
- What to try
- Write down what you were doing just before it closed. One known cause is typing a command into the F9 console.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Crash going fullscreen on Wayland
“The game closes when you switch to fullscreen on Linux.”
- Who gets it
- Linux
- What to try
- Stay in windowed mode for now.
- Staff
- “Looking into this!” IgorAlexey, 15 Sep 2026
Full details · Last checked 26 Sep 2026.
Studio only
- Your setup No word yet
Studio needs libxcb-cursor0 on Linux
“Studio aborts on start with a Qt platform plugin error.”
- Who gets it
- Linux
- What to try
- Install libxcb-cursor0 with your package manager. On Ubuntu or Mint: sudo apt install libxcb-cursor0 unconfirmed
Full details · Last checked 26 Sep 2026.
- Luduvo bug Fixed in build 44
Studio viewport ignores clicks
“Clicking in the Studio viewport does nothing and Windows plays a ding.”
- Who gets it
- Windows
- What to try
- Update Luduvo.
- Staff
- “the fullscreen=0 workaround in Settings.cfg is safe. You do not need to delete the Roaming Luduvo folder” IgorAlexey, 14 Sep 2026
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
Publishing fails with "scene check failed"
“Studio shows a Publish Failed popup: HTTP 500: {"error":"scene check failed"}. Uploading a world file on the website says scene check failed as well.”
- Who gets it
- Any system
- What to try
- Save your project in Studio so nothing is lost.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Has a workaround
Studio crashes growing a descriptor heap
“Studio crashes every few minutes.”
- Who gets it
- Windows
- What to try
- If your Studio has File > Settings > Studio Settings > Rendering > Graphics API, set it to Vulkan and restart Studio.
Full details · Last checked 26 Sep 2026.
Worth knowing
- Luduvo bug No word yet
D3D12 used without trying Vulkan
“The log shows D3D12 starting up with no Vulkan lines before it.”
- Who gets it
- Windows
- What to try
- Press Win + R, paste %APPDATA%\Luduvo\Client and press Enter. Copy Settings.cfg somewhere safe first.
Full details · Last checked 26 Sep 2026.
- Your setup Fixed in build 44
Vulkan unavailable, D3D12 used instead
“The log says Vulkan is unavailable and D3D12 is being used.”
- Who gets it
- Windows
- What to try
- On its own this is fine. Luduvo can run on D3D12.
Full details · Last checked 26 Sep 2026.
- Luduvo bug Not fixed yet
No client.log on Linux
“client.log is missing or never changes.”
- Who gets it
- Linux
- What to try
- Open a terminal and run luduvo --singleplayer.
Full details · Last checked 26 Sep 2026.
Harmless lines the log checker hides
- Vulkan validation warnings: Vulkan validation warnings. They're harmless and don't explain a crash.
- Razor shadow warnings: Shadow warnings from Luduvo's Razor renderer. Healthy logs are full of them.
- Part with an unusable scale: A part in the game you joined has a zero scale. That's for the game's creator to fix, not you.
- Folder isn't a Luduvo project: Studio was pointed at a folder that isn't a Luduvo project. Harmless.