Since my last comment I have disabled XScreensaver.
While I don't think XScreensaver is at fault it has many OpenGL intensive applications. I suspect one of them is triggering the bug. Unfortunately I can't say which one yet.
Since my last comment I have disabled XScreensaver.
While I don't think XScreensaver is at fault it has many OpenGL intensive applications. I suspect one of them is triggering the bug. Unfortunately I can't say which one yet.