User Data Problem after Basecamp Update to 4.4.6

User Data Problem after Basecamp Update to 4.4.6. Using Windows 8.1
Problems with user data after updating directly from 4.2.5 to 4.4.6
Before updating I tidied up "My Collection" with a new total of 7 Folders and did a Basecamp backup.
I performed the update but strangely the data seems to have reverted automatically to an earlier outdated collection with 4 Folders.
Even a Restore from the new backup file has no effect.
When I uninstall 4.4.6 and reload 4.2.5 the required "7 Folder Collection" is returned automatically.
Thanks in anticipation.