The vBulletin 3.6 version of the forumban hack by Zoints works just fine on my 3.8.5 board.
Don't see the issue. One exists.

I've just tried to install it again and I manually deleted the original install first. Then I copied all the files again. At the install stage I said it was a update/re-install and that seems to have done the trick. I've asked the forum mods to test it out and I'll leave some feedback as soon as they get back to me.

--------------- Added 05 Apr 2010 at 11:36 ---------------

/edit/ Thanks for the input Speysider, you encouraged me to dig deeper and find the solution.

This mod works on 3.8.4.

I found that it is necessary to go into Forum Manager and set the Forum Ban Option to "On" for each mod on each forum one at a time. I expected the process to automatically set the option to "on" for all mods / forums once it was enabled. That assumption initially led me to believe that the mod wasn't working. Perhaps an automation of some kind could be looked at in a future update.

One small point is that mods can no longer issue sitebans. I got around this by setting up a special "Temp 3 Day Site Ban" infraction with enough points to activate an immediate ban. My mods use this to combat spammers/porn posts. The temp ban can then be reviewed by an SMod or Admin and made permanent if required.

On the whole I am extremely impressed with this mod and would recommend it to anyone.