Okay, so we have a bit of a WTF here... just kind of curious about this...
Compiz with Emerald... The cube starts out kinda huge with no windows open or maximized:

Then we open up a window:

Then we open up another window:

Um, that's all in one compiz session, btw - look at the size of the cube. Appears to get smaller with each window that opens, or maximizes.

So,,, how's your compiz today?
Edit: After a very brief discussion on the Arch forum, it seems I had 3d Windows enabled in CCSM - that's what did it. Turned it off, and we're back to a proper size all 'round.

Problem with that, is then we got no 3d windows...

