Hmm. Do you know how to use SSH? If so, are the zip and gzip programs available to you at the command prompt? Did you install phpmyadmin and phpbb before you migrated? If you did, you should try uninstalling/deleting and re-installing using the Site Manager - if you can do so without losing data, having to worry about downtime/404s, etc.
Yeah, Tech Support is probably your best bet for getting this fixed (eventually ;))