Any idea why using the insert command would return a table is corrupted message but using append blank and gather does not?

*This code generates the error:
*Notes is not the selected table but is open in the current data env

INSERT INTO notes FROM MEMVAR

*This does not generate any error

SELE NOTES
APPEND BLANK
GATHER MEMVAR MEMO

EXCLUSIVE IF OFF on all workstations in the config.fpw file.
This only happens at one site that has multiple Windows XP workstations sharing VFP tables on one of the Windows XP workstations.

What is so strange is the error returned is that the table is corrupted yet the table is already open, can be opened later and updated and appended to fine, and also it can be updated any other way (like the append example above) without generating the error. However, at this location, on all workstations, whenever INSERT INTO is issued, the table is corrupted message is returned.