there have been a huge number of changes.. since then.. when you say it shows behind the other forms, is it forms within the app, or forms within your desktop?
While it would be a hack you could tell it to bringtofront, but, Im thinking theres some form props or something that has changed its not picking up correctly.
It will show on top of forms, belonging to other applications, but behind all forms belonging to its own application. "Bring to front" is not available for a form at design time at least. Can it be done in runtime?
I have compared all properties to other forms in this application without finding any differences.