Forum Pictures

[Paul I]

I'm become quite an addict on another forum. The forum sopftware seems quite similar to this one but much more basic. There are a few hundred regulars.

The forum has up to now been text only. Then an anomoly appeared, the forum got spammed. The advertisement contained a picture, never seen before in it's five year history. Nobody on the forum has a clue how they did it and are eager to find out. The owner is keeping very low profile in the search.

I've tried using UBB code, but no luck. Any ideas how this did it?