Grab Handles appearing randomly, causes erratic mouse behavior

Solution 1:

It would seem to me, despite the response in the comments, that disabling the Unity MT Grab Handles option in ccsm should be able to turn these off, erratic mouse behavior notwithstanding.

Steps to disable the grab handles:

1. Install the CompizConfig Settings Manager (ccsm). You can do this either by clicking the provided link, or by opening a terminal and entering sudo apt-get install compizconfig-settings-manager, providing your password as needed.

   WARNING: ccsm has been known to break Compiz if you are not careful! Try not to mess around in it too much.

2. Start CompizConfig Settings Manager. Look for a plugin called Unity MT Grab Handles. It should be at the very bottom when you scroll all the way down, under Uncategorized. Click its entry to enter its settings.

3. Once in, find the checkbox labeled Enable Unity MT Grab Handles on the left side of the window under Use This Plugin. Uncheck it. This should be all you need to do; close ccsm.

If there is still an issue, then perhaps you should file a bug if then restarting Compiz does not work (compiz --replace).

Solution 2:

I found a way to fix this while I was trying to find a way to redefine 3 finger gestures. I posted how I did it there: How can I disable arbitrary default multitouch gestures in Unity?

Let me know if that fixes it for you.