Anyone know what would all of a sudden cause this issue with Menu docs.

Designer view or User view open: 

          Error 1 Restoring Document definition

          Table Name already exists

All other docs - Forms, DQLs & Reports are ok - no errors

Only Menu docs affected.

The problem is most likely with the Status Table for Menu's. Menus use that as a "virtual" table so one can have virtual fields in Menus.

Status tables are in 7 and 8 automatically mantained on startup and this sometimes go haywire. 

See if there is a problem with status table for menus by running it.