We are aware that managing the forum is up to us and we have of course taken precautions accordingly. There is only a moderator log and there is no foreign involvement as far as I can see. On the other hand it is not possible to see changes made in the members personal profiles so I have no way of knowing if this is cause of a bug in the program (because it is obvious there all ready IS a bug since the preview button for posting a reply in the forums is not working) or an intruder in the forum.
For bugs I have found these links
Fetching preview problem and return to this topic problem
All Your SMF Forums Have Been Hacked. Have a Nice Day. | DeveloperSide.NET Blog
both giving suggestions for solutions to the problem I am unable to check or correct. I am only reporting a problem and if your are unable to help then I will look elsewhere. Thank you.