Comment 62 for bug 357901

The mouse cursor appearing on the wrong screen (it also becomes locked there) has been reported in other bugs, eg bug 363375.

Easy work around is to alt+drag a window across from screen 3 (where the cursor always appears to get stuck) to screen 1. If the cursor is on screen 2 but is acting like it is positioned over screen 3 then move it to screen 1 and it will not get stuck, however moving to screen 3 will cause it to get stuck.