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I don't know if it is a bug or a conflicht with other modules, but with the update to CKEditor 7.x.1.12. I got following behaviours in the user interface:
1. When open a node to edit the CKEditror defined textarea is collapsed. It has to be opened manually on the bottom right corner. I cannot find any configuration to change this behaviour back as it was: open (collapsible) by default.
2.) When setting a html layout the tags <> are set as brackets  and are not retransformed to html-tags. E.g. [b]bold text[/b] instead of Bold text