I haven't been able to sync my wallet since the last RAD was awarded at 5/15 21:50. I've tried renaming blk0001.dat to re-download the blockchain, but I get an error upon starting the wallet up. "error loading block index" or something ....
Do I need to delete all the files in roaming and backup the wallet.dat?
That would be my first suggestion. Back you your wallet.dat, and remove everything else from the roaming/radium folder. You can leave the wallet.dat.
If you want to speed up the sync, you can download the bootstrap
here and place that in the roaming/radium folder.
The wallet should then sync up ok, will probably take a few hours.
JJ