I'm running lxpanel 0.5.2 as my panel with compiz as the wm. Xorg is 1.6.3.
If i have programs (initially I noticed it with firefox and lxterminal, although it appears to affect thunar too) open at the same time, clicking on the lxpanel window list does not bring the one in the background to the foreground.
Some windows (pidgin, audacious, and others) respond as one would expect.
The X server gives this error, although I don't know if it's related:
lxpanel : X error: BadMatch (Invalid Parameter Attributes)