Catalyst 14.9 crashes trying Whirlpool -6231

I have a Radeon HD 6950 running (Win7).
Since the last update with oclHashcat 1.31 and
AMD Catalyst Version 14.9 the display driver
crashes when I try to run the Truecrypt Whirlpool
routine (-6231).
This happens with oclHashcat32.exe and the
64bit version oclHashcat64.exe.
oclHashcat stops with showing the message:
Checking for weak hashes...

I need a little help.....

Thanx in advance!
Otto