Crashes on 10.10 on load once mouse is over UI

[moos3]

Binary package hint: virtualbox-ose

here is what shows up in the Xorg logs just after the crash. Virtual box loads up just fine, but the moment you mouse over it crashes.

Backtrace:
[ 64766.107] 0: /usr/bin/X (xorg_backtrace+0x28) [0x4a0fa8]
[ 64766.107] 1: /usr/bin/X (0x400000+0x60fcd) [0x460fcd]
[ 64766.107] 2: /lib/libpthread.so.0 (0x7ff528f4d000+0xfb40) [0x7ff528f5cb40]
[ 64766.107] 3: /usr/bin/X (0x400000+0xbb22f) [0x4bb22f]
[ 64766.107] 4: /usr/bin/X (0x400000+0x2c2d9) [0x42c2d9]
[ 64766.107] 5: /usr/bin/X (0x400000+0x2184b) [0x42184b]
[ 64766.107] 6: /lib/libc.so.6 (__libc_start_main+0xfe) [0x7ff527eb8d8e]
[ 64766.107] 7: /usr/bin/X (0x400000+0x213d9) [0x4213d9]
[ 64766.107] Segmentation fault at address 0x4
[ 64766.107]
Caught signal 11 (Segmentation fault). Server aborting
[ 64766.107]

Description: Ubuntu maverick (development branch)
Release: 10.10