Originally Posted by nightdragon
If all is working across the board with other window managers maybe it's an issue with KDE. I've seen no bug reports on any of the KDE mailing lists, so I'm unaware if they know this issue exists.
No. It's never an application's fault if it crashes the kernel, the X-server, or the graphics card driver. Those are supposed to protect themselves from input that they can't digest. If they don't, it's a bug in the kernel/X-sever/driver.