I've been having one fairly serious problem with two window managers ever
since I first started using NetBSD. I don't know what causes it, and it's
difficult to describe. But basically, the window borders on windows go
black in Sawfish and Enlightenment at times, and once one goes black all
of the others do the same until the WM is restarted. An example of what
happens: http://invisible.yi.org/~jmcneill/black.png, note the AbiWord
window.

Jared