Comment 7 for bug 209408

I think that the problem occurs generally for any pointer input as the policykit authentication dialog grabs the pointer events which makes them not arrive anymore to the application in which they were generated.

The good news is that the problem has been solved upstream and it should only be a matter of time for the solution to arrive to Ubuntu.

(If I got it right, the solution is similar to the same issue in the gksu dialog, where a gconf key has been provided to disable the pointer grabbing.)