I would try these steps:
Delete the fields and place them back in the datawindow
(don't resize them).
If that doesn't work look at the code in the datawindow
events - maybe they are overriding the default behavior
Try to isolate it to see if it is the datawindow control
or datawindow object that is causing the problem.
ie put the datawindow in a dummy dwcontrol and see if
it works. then put a dummy datawindow object in the
dwcontrol and see if it works.
HTH