branimir

I runned at this problem, and it is obviously way the delphi work with
frames and inherited forms. It looks like they are supposed to be opened
in IDE at the moment of creating or opening inherited instance. Same
when you open your project. If you re project is saved with inherited
form or frame on it opened, be sure to have opened master form next time
you run Delphi.

So basicly this is my workaround solution, if you run
on such problem opening forms/frames:
1. close the unit with inherited form
2. open the master form or frame
3. then open the inherited unit again and it should work fine.

B.