Metroid, yes that is normal. The work unit will progress to around 60% and then suddenly jump to 100% completion. There is an explanation for this behavior on WCG forums but I can't recall the reasoning.

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Just another FYI. I have also experienced OS crashing when the OS and BOINC are installed on the same SSD. This has happened both with Win 7 and Server 2003. If I put BOINC on the SSD all by itself and leave the OS on a mechanical HD or another SSD, everything is fine. This never happened with Ubuntu but Windows seems to have problems with extended, heavy disk useage.