We are having issues with a excel2003 shared files.

Old setup
- User A opens shared excel makes changes saves file and keeps open.
- User B opens shared excel makes changes saves file.
- Everyone happy
- Workstations: XP, 4.91sp5, Excel 2003, file cache = on

New setup
- User A opens shared excel slowly and makes changes and saves changes slowly, and keeps open.
- User B opens shared excel slowly and makes changes and tries to save. Excel locks and makes a temp file in same directory as file.
- No else can get into file once temp file is created
- Nobody happy
- Workstations: Win7, 2 sp1, Excel 2003, tried file cache on and off

Server:
6.5sp8
NSS
Level 2 OpLocks Enabled OFF
Client File Caching Enabled OFF
Note: Server has not rebooted since the two settings above were made.

We still want to use the file sharing feature in Excel. Any help would be helpful.

Thanks a ton in advance,
Jeremy