Can't Add new Tray or Folder after Migration

Good morning,

Last week I migrated Pegasus to a new computer (Win 8 x 64) - incoming / outgoing works just as designed and no problem.

Files transfer from the new mail folder to other folders without a problem - the ONLY problem I have is not being able to create a new tray or folder!!

When trying to create a new folder (or tray) Pegasus freezes! The only way to shut down the process is via task manager.

I welcome any advice as to where to look for the issue and how to rectify.

Thanks in keen anticipation.

Boris