I help admin the taigownersclub forum. Two members have reported spy-ware/mal-ware type pop-ups while on the forum in the past month. One of them took a screen shot:
http://taigownersclub.forumotion.net/t1485-forum-owners-review-scripts-especially-advertising
http://taigownersclub.forumotion.net/t1485-forum-owners-review-scripts-especially-advertising