Opening
"Is this the right game?" every time I open my client. Your client build is one we have not measured. It works the same once you pick the right version. If you send us the client's version and where it came from in a bug report, we can add it.
The window is black or Studio closes straight away. Update your graphics driver. If it still happens, report it with the newest log from %APPDATA%\GoMMO Studio\logs\ attached.
"Vulkan is not available" when Studio starts. Studio draws through Vulkan, and your graphics driver did not offer it, so maps and models may not draw. Update your graphics driver and start Studio again.
Maps
A spawn shows a marker instead of its monster. Only the nearest spawns draw their monster; move closer or raise Monster models drawn on the Layers panel. A monster whose model files are missing from the client always shows as a marker.
The server's spawns are missing. Link the server folder on the inspector's Server tab. Some games keep their spawns only in the server.
Install says a file could not be written. The game or its server still has it open, or the folder can't be written to. Close them and try again; nothing was changed, because a failed install puts everything back.
Studio stopped unexpectedly. Your unsaved map was saved to the project as it closed. If that save failed, it is in Documents\GoMMO Studio\Recovered\.
Models and textures
A model shows "This model could not be built". One of the files it needs is missing or damaged. Check whether the project has its own copy of one; an unfinished edit is the usual cause. Move the file out of the project's files\client folder and press F5 to check against the original.
My edit does not show up. Check the Files tab. The file should be listed as coming from the project. If it still says the client, the path in the project does not match; extract the file with Extract this file to get the right path, then copy your edit over it.
My edit shows in Studio but not in the game. Studio reads the project's files; the game reads its own folder. Choose Install to copy them in. On Gate to Heavens the game reads its packs first, so repack the archive as well; see Packs: client archives.
A texture won't save. Studio saves only in the texture's own format, and a few DDS formats can't be written yet. The message names the format.
Updating
Updating fails because the program can't be replaced. The folder gommostudio.exe is in can't be written to. Move the folder somewhere under your user folder, such as Documents.
Anything else
Report a bug with the newest log from %APPDATA%\GoMMO Studio\logs\ attached, and say which game client you opened and what you clicked.