My machine spent a good part of the day deleting the enormous folder structure created by SvnBridge in the MetaDataCache sub-folder. There is a thread about this problem on the CodePlex website. I'm not sure what causes it to occur, but I would recommend avoiding the current release, SvnBridge v2. Instead download and build the source of a more recent code revision. Revision 22836 seemed to work fine for me.