OK, here's my fix!
Make sure gkrellm is positioned perfectly at the edge of the screen. Moving it one pixel inward generates the problem above. Putting gkrellm back right to the edge fixes it.
OK, here's my fix!
Make sure gkrellm is positioned perfectly at the edge of the screen. Moving it one pixel inward generates the problem above. Putting gkrellm back right to the edge fixes it.