Fit To Fill gives error (Exception: DISK_FILE_ALREADY_EXISTS, filename:)

I'm working at a client's site and I'm getting Exception: DISK_FILE_ALREADY_EXISTS, filename: everytime I try to create a Fit To Fill.

Steps to reproduce:

1. Mark in/Out on Seq
2. Mark In/Out on Source
3. Hit Fit To Fill (it prompts me to select a Bin)
4. When I hit OK, I get the error.

1. Trashed the computer name folder from the project folder on Unity
2. Re-launched
3. Re-booted
4. Prayed to every diety I know of

• OS 10.7.5
• MC v6.5.3
• Unity (Fibre connected) (not sure of the version)
• Fibre Manger v5.5.1