[ubuntu] Mouse gets stuck in secondary monitor even with "Sticky Edges " disabled

view story

http://ubuntuforums.org – Despite unchecking g-c-c / Displays / "Sticky Edges", and disabling associated settings in ccsm, I feel like sometimes the mouse gets stuck in my second monitor for a really small time when I'm switching monitors back and forth rapidly. I have the launcher enabled only in my primary one (left). The one on the right (secondary) has no launcher. The mouse gets stuck for 1 second (if that) in the right monitor left border when moving back to the primary monitor every now and then. What would be a proper way to test if it is actually holding the mouse? (I mean, not visually but ge (Hardware)