X Server stucks when moving mouse to third monitor

Binary package hint: xorg

==== BACKTRACE ====
[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x28) [0x4a3248]
1: /usr/bin/X (mieqEnqueue+0x1f4) [0x4a2ac4]
2: /usr/bin/X (xf86PostMotionEventP+0xc4) [0x47cea4]
3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7fdc80bc7000+0x53cf) [0x7fdc80bcc3cf]
4: /usr/bin/X (0x400000+0x6fca7) [0x46fca7]
5: /usr/bin/X (0x400000+0x11d1f3) [0x51d1f3]
6: /lib/libpthread.so.0 (0x7fdc86835000+0xf8f0) [0x7fdc868448f0]
7: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fdc8140f000+0x77f20) [0x7fdc81486f20]
8: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fdc8140f000+0x7975d) [0x7fdc8148875d]
9: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fdc8140f000+0xd4a95) [0x7fdc814e3a95]
10: /usr/lib/xorg/extra-modules/nvidia_drv.so (_nv001066X+0x69) [0x7fdc814b0359]
11: /usr/lib/xorg/extra-modules/nvidia_drv.so (_nv001643X+0x2b1) [0x7fdc814700c1]
12: /usr/bin/X (0x400000+0x13df18) [0x53df18]
13: /usr/bin/X (0x400000+0x13d368) [0x53d368]
14: /usr/bin/X (miPointerUpdateSprite+0x15b) [0x45c17b]
15: /usr/bin/X (0x400000+0x5c319) [0x45c319]
16: /usr/bin/X (0x400000+0x168000) [0x568000]
17: /usr/bin/X (mieqProcessDeviceEvent+0x19a) [0x4a264a]
18: /usr/bin/X (mieqProcessInputEvents+0x60) [0x4a2710]
19: /usr/bin/X (ProcessInputEvents+0x9) [0x46fe69]
20: /usr/bin/X (0x400000+0x30943) [0x430943]
21: /usr/bin/X (0x400000+0x261aa) [0x4261aa]
22: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7fdc8552dc4d]
23: /usr/bin/X (0x400000+0x25d59) [0x425d59]
====

I have three monitors at 2 graphic cards. Since Ubuntu 10.04 if i move the mouse to the monitor, that is at the 2nd graphic card the mouose begins to stuck and if i press any key, the Gdm ist restartet. I have added the nvidia bug report, since there is a bacaktrace for the errors.