Comment 11 for bug 319726

I am affected by this as well. It only began happening since recently. Recent changes on my system would be:

* Upgrading to grub2
* Enabling framebuffer for kernel with uvesafb
* installing gnome-do and docky
* Completely redoing the panels on my desktop.

I deleted and re-added the clock applet, too, it may be related.

I noticed that whenever this happens, the entire panel becomes "frozen". It works, can be used, but applets within never refresh. For instance the virtual desktop chooser works fine but the tiny window previews inside don't reflect reality anymore.

Running on 10.04 x86_64, fully up to date, nvidia-current.