I have a two port switcher for a USB keyboard and mouse. I was on Kubuntu 10.04 before recently moving to 11.04. I have noticed that if I use this switcher to move the kbd/mouse to another machine, when I bring them back again, the mouse is nonfunctional. You can MOVE the cursor, but clicking on things doesn't work. This doesn't happen with Win7 on the same machine, nor with WinXP, and didn't happen with older Ubuntus. But I have two machines that behave like this under 11.04. Any ideas? The keyboard has no troubles. It's only mouse clicks. Oddly, they work *sometimes*, but almost all clicks seem to get dropped. After this happens, if I restart the X server, things go back to normal. But that's a huge pain.