Comment 4 for bug 1219636

Apparently something has activated the BFB quicklist, which does a pointer grab bounded by the physical display window. The Launcher scroll works by trying to move the mouse outside of the physical display window, and the grab prevents that.

Something in the entire test stack has changed recently so that either (1) the BFB quicklist has been left showing when previously it hadn't been, or (2) many applications are left running by other tests so the Launcher is full, requiring a scroll, when previously it hadn't been. Either way, it looks like the results of previous tests are affecting the functioning of this test.