I have upgraded ckeditor to 3.6.6.1 (was 3.6.6 before).
I see a slight improvement (ckeditor is back and i can post) but ckeditor is lacking some icons in chrome.
Ckeditor still works fine in i.e and firefox.
Please dont hesitate to report bugs/issues on this matter (ckeditor).
Edit...
Finally back to previous/old version :
With new version, after a page refresh, ckeditor is messed up in any browser...
With old version reverted, everything seems to be ok now in any browser...
It appears that the ip.board guys have customized the default ckeditor which is a shame as you cannot then upgrade this module/feature without breaking the board...
At the end, I suspect some php cached session/code was the issue.
Fingers crossed, we are good to go for another round now