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Forgive me if this has already been addressed...

I, too, was having problems with groovefish (the fixed cab version from the author). It would hang on a search, and the debug log was giving the net3.5messages.en (spelling's probably wrong, I'm recalling from memory). I had it installed to main memory. Then I read somewhere that a user installed it to the SD card, so I gave it a go, and it worked like a charm. Don't know why, and don't know if this is a universally applicable workaround, but I decided to post it in case it proves helpful.