On one workstation get an error under the following circumstances:
 
IN-A, Hit F2 for the lookup.  Change sort to 2nd description (where we put OEM part number).
Type in the number until you get to the item you are looking for.
If you hit the Enter key - you get the error below.  If you double click the item with mouse, you don't.
 
Fatal Error - File: ListG60.lib   Line: 285
The array element specified is out of range for this field.

Well, since the 08/04 update - this error no longer happens.