Window manager collapse?

[Eddie]

This is on Foresight Linux 2.5, 32-bit. I installed it on my laptop last
week, ran an "updateall" command yesterday, and ended up with Xfce
4.8.2, bumped up from 4.8.1.

Today, I fired up Foresight, idly went into Settings | Appearance |
Themes, and switched from the default "xfce-green" to another: I
believe it was "xfce-kde2". Immediately after that, everything started
acting differently. Emacs and Opera opened without the
minimize/maximize/close buttons, and the window position covered up the
top panel. Same with the terminal emulator. Otherwise, they worked. In
Firefox, the menus were almost inaccessible, and keystroke commands
(such as Ctrl-Q for Quit) didn't work. To close Firefox, I had to click
on the File menu to open it and then hit Q on the keyboard before the
menu disappeared.

The same thing happened once before, when I first installed Foresight
Linux on this laptop. At the time, I just plowed it under and installed
something else, but I like Foresight and decided to give it another try
here. (That wouldn't have anything to do with the version of Xfce,
because I'm quite sure 4.8.2 wasn't yet out.)

The same thing happened on Mageia beta 1; there I installed the Xfce
packages myself. It was the exact same symptom, though I do not believe
I ever tried to change the default theme. The window manager just
stopped functioning correctly.

I've also had 64-bit Foresight on one other computer, and Xubuntu
11.04 (beta 1 and final) on two others, with no ill effects.

Is there a file somewhere in Foresight that I can delete and have it go
back to the "factory settings"?

Is this a known problem? I looked through the Xfce Bugzilla and didn't
find anything like it from this year, but I may not have been searching
correctly. If this is in Bugzilla, I can look again and attempt to add
my report to what is there.

Sorry to make my first post on this list a whinge. Outside of these
bumps, I am enjoying the hell out of Xfce.