WORKAROUND: Turning "Visual Effects" on (from "None" to "Normal") in the Appearance Preferences seems to get rid of this problem.
By the way, I am using the radeon drivers. This may be the source of the problem.
WORKAROUND: Turning "Visual Effects" on (from "None" to "Normal") in the Appearance Preferences seems to get rid of this problem.
By the way, I am using the radeon drivers. This may be the source of the problem.