Well I tried to find the test file that had the C.P. Window problem, but can't, even after quite a search.
I know it was ac12 and it was a clean test file not a file brought up from 11, (so it should not have had 11 libs) so I'm stumped without being able to find the file.
Although I do remember quite clearly that I checked two standard windows and both created the same close to corner problem with the C.P..
So now, I created a new clean test file and new C.P. wall with core and finishes and had no trouble at all with windows, even right up to corners.
So intermittent or user error??
If I never find the file, I guess I'll never know.
Thanks for your reply though.
Bier