Would you be so kind as to type startxfce4 are you using a nvidia card or the intel card or ATI if nvidia you should install from extra the
xf86-video-nouveau-git_065576d5df0d-x86_64-1.txz for Nvidia. If you read this for current
CHANGES_AND_HINTS.TXT you will see that default is set to kwin desktop for composite.
as per above. .
Quote:
the default setting /.kde/share/config/kwinrc in the [Compositing] section. I have Backend=Xrender for the nouveau driver
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this has caused a lot of problems. in current with certain cards. this needs to be set to.
or do as I did delete it. You need to read
this thread if running current. but the problem you are having was dealt with in November 2010.