PT & Mezzo ask "Where is?"

[UltraJay]

Using ProTools 4.3.1 and Mezzo 3.6, we record 'song 1' with the audio (tracks) distributed to three drives. When we drag 'song 1' session file to
Mezzo's Archive window, it backs up fine. Then we clean the drives and restore by dragging the 'song 1' session file to the desktop - Mezzo puts
everything back just right and upon opening the session, PT knows where everything is - all is well.

Now, if we do a SAVE AS command (as would happen when you start mixing and would like several versions of the song) and put the new session
'song 1 mix 1' into the same session folder, Mezzo does a backup (because the checkbox for BACKUP CONTENTS of session folder is checked).
Again, we clean the drives and restore 'song 1 mix 1'. All the files are restored, however upon opening the session, PT no longer knows where the
audio files are located (the dreaded "Where is...?") Before we cleaned the drives, PT knew where they were, but after the restore it didn't.

Any ideas?

Jay Gallagher
Ultrasonic Studios