Coming out of screen lock mode

[Alain Muls]

Hi All,

I am running Ubuntu 11.10 using Unity.
I like the unity interface but I have since a couple of weeks a major problem.

Sometimes when the screen is locked (screensaving mode), the system
will not redisplay.
Everything is still running (eg. a script continues to run) but the
X-display is black with only a mouse cursor visible.

Is there anything I can change?

Tx/Alain