Unable to make MDE file?

At me this sometimes whappens when I use ActiveX control on Access form, which version was changed since it was inserted. In this case only recreating form helps. I do the following steps:
- make a backup
- remove forms one-by-one, keep trying to make mde in order to find which form cause this problem
- once "bad" form is found - I recreate this form, first inserting ActiveX control, then copy/paste other controls and code.