Alright. I think that I found the answer. If you all have any insight it would be helpful.
In this post there were old links to threads from the old 6.5 UBBThreads plus some url's to external web sites. All of the old threads links were dead and several of the external sites were as well. Once I removed ALL of the "[ url ]" tags, the "forbidden" message went away.
So, does version 7.5.7 have code checking whereby those "[ url ]" tags are validated?
