I've spend the morning going through the settings of all 813 of our active forums to ensure the One Sig Per User Per Page plugin is enabled. (I counted while I was at it, heh) It was on in maybe 100 of our forums, which explains the reports of it working sometimes and not working most the time. I apologize, I assumed when Rob installed it a good while back that it was a global one-checkbox-for-all-forums plugin. It most certainly is not. So, it's now on for all our forums. If anyone notices a forum I've missed or one we fail to enable it on in the future - please let me know. I've considered this announcement worthy considering with was very largely NOT enabled, so now many users will suddenly notice a change in the forums they frequent that they may not have previously even known existed. On a related note, I now have carpel tunnel - and will be sueing Rob.