[AccessD] Data Refresh Problem

Has anyone experienced Access FE forms (2k-2k3) not refreshing properly over
a network?
 
1GB Ethernet to the BE. All other work stations work well but this
particular WS does not refresh data even when refresh is done manually with
records refresh or F9. the only way to get the new data is to close the app
and reopen it.
 
The only difference between this WS and others is that it goes through two
GB switches to get to the BE. The others go through one switch. Any ideas on
why this may be happening?
 
BTW this is not my app but I have access to the source code. The developer
has not been able to figure this out on her own.
 
TIA
John B.