This happened due to two factors:
1) the standalone build would show a message box warning because it couldn't change the current/working directory
2) the gui schedules InitServerTask to run on the background thread. This in turn will eventually call Server.Start on the background thread, which in turn will call Logger.Log(..) which in turn calls back to Window.LogMessage
Note that the UI can only be updated from the main/UI thread. Normally this wouldn't cause any issues, because LogMessage checked whether 'InvokeRequired' returned true or not - if it did, then LogMessage scheduled the message to be logged later on the main/UI thread by using BeginInvoke.
However, it was rarely possible that due to thread scheduling, the call to LogMessage from the background thread would be run *before* the main window control handle had finished being created.
And unexpectedly, 'InvokeRequired' would return *false* if the main window handle hadn't been created yet - and hence the background thread would attempt to directly update UI controls with catastrophic consequences. Sometimes this worked, but other times it would cause the app to SIGABRT and crash in X11 somewhere, usually in X11Keyboard:XCreateFontSet
So to workaround this I made the following changes:
1) failing to set working/current directory doesn't show a warning message box popup anymore
2) LogMessage doesn't check 'InvokeRequired' anymore and just always calls BeginInvoke to schedule the message logging on the main/UI thread
So in the most of the rare cases when this issue even happened, it shouldn't occur anymore now. However, the underlying issue still isn't completely solved.. if you change the code to show a message box before the main window, you'll still rarely end up with the main window being a black box with X11
Although still documented on the wiki, I decided to simplify in-game help by removing it because
1) basically none of the current public command/plugin ecosystem uses visual basic
2) even when mono-complete is installed, you don't get a Visual Basic compiler (still need to install another package for it)
CmdCreate generated example commands now use LevelPermission.Owner instead of LevelPermission.Nobody
ReplaceBrush now says 'replace' instead of 'draw with' when don't have permission to modify the block
