Changing workspace amount by holding mouse on "up" button causes 100% CPU usage, and the workspace amount will constantly change up and down. This happened on my netbook recently. A workaround: killall xfdesktop. Distro: Xubuntu 12.10 amd64
Does this still happen and can you try troubleshooing with strace if it still does? https://wiki.ubuntu.com/Strace
Marking resolved due to lack of response. Feel free to reopen if it happens again.