I think I witnessed two bugs in uforadiant:
1. If I click on 'save' while brushes are selected (without closing radiant), then recompile the map and start it in ufo, the selected brushes are not displayed (not saved with the map ??).
2. After undoing some editing, I ran out of things to undo, but the undo button was not disabled.
Unfortunately I was not able to reproduce it. Allthough I think I saw #1 several times now.
I'm a total newbie to radiant and it might be just me, so I'm asking the 'professionals' here: did you encounter things like that ?