Salut Lionel,
it's me again with the same issue on another topic.
History: I had to edit the topic 3-4 times, because my browser/editor toolbar does not work properly. Can't add links; messed up formatting for linebreaks/paragraphs after using backspace/delete key. The usual play ;)
Anyways, after my last save and submit I got the access error again. I noticed that the forums category has changed in the URL?!
It turned from:
http://www.seblod.com/community/forums/general-discussions/watermark-on-uploaded-images#post24882
to:
http://www.seblod.com/community/forums/standard-premium-memberships/watermark-on-uploaded-images#post24882
Any clues?