urgent MythTV crashes after installing Nvidia drivers

[Paul]

I've swapped repos from atrpms to Fusion and X and KDE starts ok but as soon as I start 
Mythfrontend X crashes back to Logon screen


[  1944.020]
[  1944.020] Backtrace:
[  1944.020] 0: /usr/bin/X (xorg_backtrace+0x4a) [0x80ac51a]
[  1944.020] 1: /usr/bin/X (0x8047000+0x6a598) [0x80b1598]
[  1944.020] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb770640c]
[  1944.020]
[  1944.020] Segmentation fault at address (nil)
[  1944.020]
Fatal server error:
[  1944.020] Caught signal 11 (Segmentation fault). Server aborting
[  1944.020]
[  1944.020]
Please consult the Fedora Project support
          at http://wiki.x.org
  for help.
[  1944.020] Please also check the log file at "/var/log/Xorg.0.log" for additional 
information.


any ideas on how to fix this or what to check?


Paul