mouse cursor is doubled and therefore can not reach every screen coord (e.g. Bound around, Summer Bound, Christmas Bound)

0.4.11-RC-23-gb5fef42 gcc dbg linux, VBox 4.3.12 + VBEMP + AC97

The following 3 SDL-based applications from rapps are affected:
Bound around
Christmas Bound
Summer Bound

I noticed this bug the first time for ros 0.4.1release-tests and since every release since then.

The mouse cursor is secretly doubled, and therefore the ingames mouse cursor can not reach any arbitrary screen position, e.g. in the video i am not able to reach the OK button, because the second hidden mouse-cursor hits the bottom of the screen.
0.4.11-RC-23-gb5fef42.webm
0.4.11-RC-23-gb5fef42.log

Side-note: In my earlier tests I linked this always against CORE-11564, which was recently resolved as CannotRepro, therefore I created this new and more distinct ticket today.