Comment 22 for bug 375905

I'm pretty sure this isn't about the mouse not moving, or about Logitech hardware specifically. I get a very similar problem but the symptoms I've noted are a bit different. Luckily I can reproduce this case all the time on my 11.04 box:

 - Click on the power button icon, select System Settings
 - The window appears with the various options laid out in a grid. I click 'Appearance'.
 - Appearance app opens up, in front of System Settings app, as expected.
 - When I click on the Appearance app, the mouse clicks go THROUGH that app and click on what is behind it.
 - This way, I can launch other apps within the System Settings window even when clicking directly on the Appearance window.
 - I can continue to click on things in the System Settings window through whichever new windows appear, if I know where on the screen below the top-most window they are located.

So it's not that the mouse pointer is stuck, it's that the clicks are going to the wrong window entirely. The mouse position is reflected correctly however.

This happens for me with both of the mice I have tried in the months that I have had this problem (a Razer Diamondback and now a Cyborg R.A.T. 5 mouse). Both work fine on Windows XP, Vista, and 7. Both are USB and wired. And both work fine in Ubuntu up to the point where this issue appears.

I sometimes have another pointing device attached (USB Wacom tablet) but I made sure that was disconnected today and still the problem appears.