Just started up 0.9.9.1, ran the first level, everything ran fine, but I realized that diagonal movements were the default (I use a laptop without a number pad). Went into the ini and updated controls, along with adding some message colors.
After finishing, started DoomRL.exe, tried clicking the X to close (to test out the LockClose=True), went down to Exit and hit Enter, program is now hanging. Blinking cursor at top-left corner of screen. I am running Windows Vista (no comments).
I haven't closed the program, not sure exactly how other than killing the process in task manager. I can post up my ini if needed.
EDIT: One more thing I just noticed. The game is stopped on the main menu ("Exit"), and there is a long scrollbar at the side, all black emptiness below the menu.
EDIT2: Got bored, closed in task manager, tried to replicate the bug with little success. The long scroll bar appears every time in hitting Exit, but the program has not stopped again so far.