I can't get a cuda work unit to successfully finish...

I have a late-2009 Mac Mini with an NVIDIA Geforce 9400, 8 GB RAM, 320GB HD with around 150GB free.
Mac OS X 10.8.2. Newest available version of CUDA (5.0.37).

Any ideas?

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BOINC log says "Aborting task xxx: Exceeded disk limit: x.xx > 5.00 MB

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Task stderr on my stats web pages say:

<core_client_version>7.0.31</core_client_version>
<![CDATA[
<message>
Maximum disk usage exceeded
</message>
<stderr_txt>
treamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:14:39 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable'
... ( a ton more of these error messages)
[Jan 05 18:15:14 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:15:14 UTC] *Break* (found exit flag file)
[Jan 05 18:15:14 UTC] RC5 CUDA ERROR [0]: #46 'all CUDA-capable devices are busy or unavailable' (cudaStreamCreate)
[Jan 05 18:15:14 UTC] RC5-72: Saved D1:1B887200:00000000:16*2^32 (0 keys done)