>Thanks all for the replies.
>* No ActiveX controls -- all the controls are what VFP has natively
>* There are classes involved -- but these classes are used elsewhere w/o any problem
>* This is occurring with only a few forms -- I've got many more forms that *don't* have this behavior
>* Saving the form, doesn't clear this problem -- the behavior occurs when I re-open the form.
>* There's some sort of combination that's causing the problem.

On a hunch, I tried "de-constructing" the form by removing items in stages to try to narrow down -- finally got it to a point where I stopped getting the odd behavior (Form Designer thinks form has been changed).

Went the other way 'round and started re-creating parts of the form by starting with an empty form, then started adding the controls one-at-a-time. Was able to determine that the problem begins occurring once I add a spinner control on a page in a pageframe. Adding spinner directly onto the form doesn't cause this problem however.

Just did a quick check in VFP 9.0 -- the problem doesn't occur in that version.