I haven't tried a restart yet (indeed, I haven't really tried anything, to fix: I just thought I'd check to see if it was a known issue before I started fiddling). I've deleted MAP.rwm, and am going to restart- I'll post a screenshot if it recurs.

One possibly salient fact is that I'm running EB using the BI .exe, thanks to an installer available around here somewhere, whose creator's name I unfortunately can't remember.