I see a few people were able to try it. I deleted it since I don’t think it did anything. I plan to release 21.8.5 soon which has a few improvements that do seem to help. It’s nearly impossible to know for sure since it occurs randomly.
I teleported back and forth 20+ times when going client and it crashed maybe one time and there was no error window.
Also, I made some improvements for CrapTrap which will detect the error windows and restart it if they occur.
The errors are coming out of GFXFileManager which was recently updated. It seems to be from when it loads a file from the PK2. I don’t know what the dialogs say since the text is Korean but not translatable because they call the ANSI MessageBox function. So, there’s no way to know what the error is for other than the title occasionally having the file it failed to load.