I had the same problem but fixed it. Its not a fix which will end this bug, because it still needs to be fixed.
I had the exact same problem as Chris Lee. I noticed that the mouse sometimes on the host screen, changed icon, as if it was over some text but it wasn't. So I figured it thought that one of the screens actually were the other one.
Here's what I did:
I changed my visual settings, so the to screens changed place in xinerama, and I changed the cabels so screen 1 now were screen 2.
I had the same problem but fixed it. Its not a fix which will end this bug, because it still needs to be fixed.
I had the exact same problem as Chris Lee. I noticed that the mouse sometimes on the host screen, changed icon, as if it was over some text but it wasn't. So I figured it thought that one of the screens actually were the other one.
Here's what I did:
I changed my visual settings, so the to screens changed place in xinerama, and I changed the cabels so screen 1 now were screen 2.
That fixed the problem for me.