Can I presume, Grubba, that you have a dual-monitor setup?
I have seen this problem resolved on a dual-monitor configuration, by adding a line to the vslick.ini (in your configuration directory) that corresponds to the resolution of the monitors.
(Primary and secondary, respectively; in this example both were 1600x1200)
The line to be added to your vslick.ini would be similar to the following, using *your* particular primary and secondary monitor's resolution settings:
VSLICK=-summ "1600 1200, 1600 1200"
I hope this helps!
Mike