Problems loading Gnome

Hi,

i recently installed Beta4 sucessfully, but after login i have to wait 
10 minutes to get a workin system.

Dmesg shows this:

lock order reversal
 1st 0xc097f8e0 UMA lock (UMA lock) _at_ /usr/src/sys/vm/uma_core.c:1494
 2nd 0xc1060144 system map (system map) _at_ /usr/src/sys/vm/vm_map.c:2317
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c09348c0,c0934a00,c08bef84) at kdb_backtrace+0x29
witness_checkorder(c1060144,9,c0875486,90d) at witness_checkorder+0x564
_mtx_lock_flags(c1060144,0,c0875486,90d) at _mtx_lock_flags+0x5b
_vm_map_lock(c10600c0,c0875486,90d) at _vm_map_lock+0x26
vm_map_remove(c10600c0,c1d05000,c1d06000,cc9ffc0c,c07827a9) at 
vm_map_remove+0x1f
kmem_free(c10600c0,c1d05000,1000,cc9ffc3c,c0782156) at kmem_free+0x25
page_free(c1d05000,1000,2) at page_free+0x29
zone_drain(c103f000) at zone_drain+0x26a
zone_foreach(c0781eec,cc9ffcec,c07940d7,cc9ffc74,246) at zone_foreach+0x37
uma_reclaim(cc9ffc74,246,0,cc9ffc80,c062b7d9) at uma_reclaim+0x12
vm_pageout_scan(0,c097fd40,0,c0876973,604) at vm_pageout_scan+0x103
vm_pageout(0,cc9ffd38,0,c0794f2c,0) at vm_pageout+0x2c3
fork_exit(c0794f2c,0,cc9ffd38) at fork_exit+0xa0
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xcc9ffd6c, ebp = 0 ---


What can this be? What can i do?

Roger