[AccessD] Odd Form Behavior

Dear List:
 
I have a form in an Access 2003 app exhibiting some odd behavior.  The form
is bound to one table.  When anything on the form is changed, the form seems
to lock - that is, you cannot move to another record using the navigation
buttons.  Before making a change, the navigation buttons work.
 
I put a 'Save' button on the form with the one line in the click event
DoCmd.RunCommand acCmdSaveRecord which generates the unhelpful error 'Run
Time Error 2501 - The RunCommand action was canceled.'
 
If I put 'DoCmd.RunCommand acCmdSaveRecord' in the dirty event, it saves the
record but the navigation buttons are still not functional and I can't go to
design view.
 
Further, clicking 'View' and 'Design View' does not work at this point. I
have to click the 'Exit' command button on the form or File-->Close. If I
use the close button of the form I get a message "You can't save this record
at this time." although the record was saved because I added
'DoCmd.RunCommand acCmdSaveRecord' to the dirty event.
 
To eliminate the possibility that my installation of Access on this machine
got hosed, I moves the app and back end to a second machine and got the same
results. 
 
I would prefer not to use the save on the dirty event because I have an undo
button that the user likes.  But I think if someone can lead me a solution
of the navigation button thing, this will solve the save problem.
 
Any ideas?  I'm stumped.
 
MTIA
 
Rocky Smolin
Beach Access Software
858-259-4334
www.bchacc.com <http://www.bchacc.com/> 
www.e-z-mrp.com <http://www.e-z-mrp.com/> 
Skype: rocky.smolin