mdavey -- So it just hangs at 25% of rebuilding? So at this stage your Empeg is just left in Synchronizing mode like he's talking about as well?

Would you mind running jemplode from the commandline (java -jar jemplode.jar) get it to hang and leave it just couple a minute or two then send me the console output?

Also, I'd be interested to see you do a Ctrl-Break (in the console) when it's hung and send me that output as well.