MT WU Problems?

I've had a couple MT WU lately that only use in the area of 40% of my cpu capacity and if I restart the BOINC client the WU start from scratch.
Whaazzup?

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there is Something going on with the MT n=body wu. Hanging up for hours at the end and no it's not a matter of needing a few minutes to finish.
Turning them off.

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