Thanks for the tip, I have checked all the forum permissions and the only group that can see this forum is Admin and Moderators. The user that posted a thread here, was neither of these and all the other groups are set to "No" for all options.
The post is still there and if I am logged in as a regular user or any other group, I get the message:
Invalid Thread specified. If you followed a valid link, please notify the administrator
This user has now been set to a "restricted" group with very few privileges as we suspect that he may have some hacking skills.
Thanks for any help with this so far.
Hans
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