oclhashcat 1.01 benchmarks fail AMD Radeon 7970

Hi,
I'm quite new to using oclhashcat so forgive me if I missed something obvious.

I just upgraded from an nVidia Quadro 2000D to a AMD Radeon HD 7970 and I am getting a problem when running the benchmark -b option.

It fails with an error in the same place every time I run it:
PS C:\Users\Administrator\Downloads\oclhashcat\oclHashcat-1.01> .\oclHashcat64.exe -b
oclHashcat v1.01 starting in benchmark-mode...

Device #1: Tahiti, 2048MB, 925Mhz, 32MCU
Hashtype: MD4
Workload: 1024 loops, 256 accel
Speed.GPU.#1.: 16053.9 MH/s
Hashtype: MD5
Workload: 1024 loops, 256 accel
Speed.GPU.#1.: 8014.7 MH/s
Hashtype: SHA1
Workload: 512 loops, 256 accel
Speed.GPU.#1.: 2516.3 MH/s
Hashtype: SHA256
Workload: 256 loops, 256 accel
Speed.GPU.#1.: 1009.6 MH/s
Hashtype: SHA512
Workload: 128 loops, 256 accel
Speed.GPU.#1.: 75153.6 kH/s
Hashtype: SHA-3(Keccak)
Workload: 256 loops, 256 accel
Speed.GPU.#1.: 141.6 MH/s
Hashtype: RipeMD160
Workload: 256 loops, 256 accel
Speed.GPU.#1.: 1629.6 MH/s
Hashtype: Whirlpool
Workload: 256 loops, 256 accel
Speed.GPU.#1.: 31003.7 kH/s
Hashtype: GOST R 34.11-94
Workload: 256 loops, 256 accel
Speed.GPU.#1.: 99653.0 kH/s
Hashtype: SHA-1(Base64), nsldap, Netscape LDAP SHA
Workload: 512 loops, 256 accel
Speed.GPU.#1.: 2516.9 MH/s
Hashtype: SSHA-1(Base64), nsldaps, Netscape LDAP SSHA
Workload: 512 loops, 256 accel
Speed.GPU.#1.: 2502.2 MH/s
ERROR: clEnqueueNDRangeKernel() -4

I have tried a fresh install in case there was a problem with the kernels from the previous card but it has made no difference. I know someone else using the same card and the same config as me but I think they are using older oclhashcat-plus.

Other than this problem the card and oclhashcat seems to function perfectly with example scripts and the hashes I've tried.

Any suggestions much appreciated?

Andy