Problems with startx on 5.2-RC2

[Jaroslaw Nozderko]

OS: FreeBSD 5.2-RC2 (MAC - biba,mls)

Hi,

 I have problem with X on 5.2-RC2. Sometimes the whole
system hangs when I start X by startx or 'setpmac mls/equal startx'
(with MAC policies loaded). In about 30% of attempts it hangs on 
XFree startup messages and hard reset is required.
The problem occurs a little bit too often for some unrelated
accident and it doesn't occur at all on 5.1-RELEASE (the same
hardware and configuration).

Does anyone have similar problem ?

Regards,
Jarek