I see this quite a lot. Windows XP+SP2, JEmplode 61, Ethernet connection, v3aplha7+Hijack413. Approx 6.7 GB of a 9 GB drive is used. I do have some other things on the system (ttsclock, empTelnet, web interfce).

JEmplode shows "Rebuilding music database" with approx 20-25% progress bar. Always stops at the same point.

I just put it down to the beta software.
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Michael
Ex-owner of stolen empeg #030102741