On Drupal 7.12 I have CK Editor working OK EXCEPT FOR THE BODY FIELD OF ONE Content Type.
I added a dummy "long text and summary" field on that content type and it doesn´t work either. In every other content type it works OK. I´m also using the Fieldgroup module ver 7.x-1.1+65-dev, but I created an extra content type to see if it was some type of incompatibility, but CK Editor keeps working on the dummy content type, but not in the first one.
The behaviour is that instead of showing the CK Editor window the field to edit appears as a plain text one. It can be edited but without CK Editor user interface.
I know that one possible solution may be recreate the problematic content type but I will appreciate any clue that does not need to rewrite all the display and feeds interface.