I used to have a similar problem with X and afterstep
where i would have green vertincel lines at top of x window and moving
a window over them would get ride of them nerver knew what it was like
that for my gess was low ram when changing windows caused fauilt in it
refresh damed if this has anything to do with your problem but thats
all i can think of hope it helps :)
--
"Data itself isn't good nor bad, data just represents the surrounding reality.
The more data we may access, the more accurate model we may create of the
reality, thereby also define our actions in ways that are maximally beneficial
to our aims. The net must not be restricted by moral, ethical nor legal issues
prevailing in different world locations, data must flow freely." -- chip.