[AccessD] Fault in MSO9.DLL

Hi All,
 
 Wondering if this rings a bell for anyone...
 
 I've got a client that has an Access 2000 program that is randomly
generating a fault in MSO9.DLL.  
 
 It always faults at offset 0x0007b9f2 with a 0xc0000094, which is a divide
by zero error.
 
 This program has been solid for years and now is faulting for some reason.
SQL Server is the backend.
 
 There are numerous apps running on this server (2008 R2) and none are
having problems except this one. Nothing new or has been changed that I'm
aware of.  Things I have done:
 
1. Rebuilt the DB - fresh MOB, imported tables and queries, did
saveastext/loadfromtext for forms and report, and cut and pasted all code
from old to new. New DB compiles fine.
2. Compacted and repaired.
3. Turned off name Auto correct.
4. Replaced the MSO9.DLL from another machine
5. Renamed MSO9.DLL and then did a repair on Office 2000.
6. Doesn't appear to be a resource problem; happens with as little as
processing a few orders or a hundred and I can turn around and process the
batch that just failed and it will go through fine.
 
Any thoughts are welcome.  I've been hacking away at this for about five
days now and it's driving me nuts.
 
Jim.