Unable to verify referring url Error when deleting old topics/post

[Angelina Belle]

What mods are you running?
I did a quick search on "Unable to verify referring url " and found out that another user discovered that the mod Ad Seller Pro caused the problem:
http://www.simplemachines.org/community/index.php?topic=415940.msg2948382#msg2948382
The mod's author (vbgamer45) posted a fix on his site, and said that this issue "Might impact a lot of mods"
Arantor suggested that this issue might crop up in other mods that have been ported from 1.1.x to 2.0, if the author was not careful to update how it does things to the URL.