[openbox] Windows in The GIMP behaving badly. [SOLVED]

[52midnight]

Solved it, and learned something in the process. A reply on the Gentoo  
forum odffered a workaround using "Single Window Mode". I'd never come  
across a "single window mode" switch, but when I went looking, I found the  
following in

Edit > Preferences > Window Management:

Window Manager Hints:
   Hint for the toolbox:
   Hint for other docks:

Setting both to 'Normal' fixed things. Sorry to bother y'all, although I'm  
still puzzled why my gimprc settings didn't take effect.