Problem: Sometimes when a window is resized or moved quickly, compiz appears to lose track of where the cursor is causing it to appear like the cursor is grabbed on the completely wrong part of the window.
This seems to happen when I resize the window smaller than the minimum size. For example, with gnome-terminal, resize the window from the lower right corner and then move the cursor rapidly around above and to the left of the upper left corner.
Fixed in CVS, but not built yet