Would it be a good idea to check / eliminate any differences in the way the workstations are configured? Can you try one or these tests?
1.
-- Make a test database which is not split, i.e. just a single .mdb file, which can print a test label.
-- Copy this onto the C: drives of two workstations - one which prints OK, and one which does not.
-- Run these local copies, and see whether the printing problem is still present
2.
-- If you can do a test print from another application, e.g. Word or Notepad, try this on both machines
3.
-- Swap a Dymo printer from a workstation which prints OK, with one which does not.
I think that a different result in test 1 only would suggest some difference in the way Access is configured. The problem showing up in both tests would suggest that it is not Access-related, but to do with printer drivers or configuration.
Test 3 would show if there is some hidden difference in the printers - e.g. they all appear to be the same model, but perhaps some are later versions, have different firmware levels etc.
I hope these thoughts will be of some use.
Bob Stubbs