When I first installed 185.18.08 I had compiz disabled and did not get X-crashes when switching VT.
(The terminal stays blank as it has allways done on my 9600m GS.
killing X and reposting the videocard with vbtracetool -p would restore it. But I didn't do this now)
As soon as I turned compiz on I get an X-crash when I switch VT (CTRL-SHIFT-F1).
(terminal stays black, like above)
When I witch back to X (SHIFT-F7) X crashes or restarts.
I end up on the login screen, the same as reported earlier in this thread.
I now also sometimes get black squares in stead of letters when I type in a gnome-terminal with compiz enabled.
(I do not get these with compiz disabled)
See screenshot, right-bottom
I attached bugreports without compiz and after compiz enabled (=after a VT switch X-crash)
system: ACER aspire 6930G
card: 9600m GS 512 MB DDR2
kernel: 126.96.36.199 x86_64
OS: ubuntu hardy 64bit