[AccessD] Data has been changed

Hey All
Can someone explain to me what is causing this message???
I have a list box that is used to query a subform. If I selected the 
first item in the list and went in and edited the subform and then 
clicked on another item in the list I got the weird error message "Data 
has been changed....". Sometimes it would work fine for many clicks on 
the first item and editing but then up would pop the message.  If  I 
selected any other item in the list and edited and clicked on another 
item everything worked fine. I tried saves, dirty =  false, and requerys 
nothing worked. Finally put Me.RePaint in the OnExit of the subform and 
eveything seems to be working fine.  I have other list boxes and 
subforms and they all are working fine. Is this problem due to a damaged 
or corrupt form?

Thanks