Quote Originally Posted by TinCow View Post
As noted previously, this is a bug with vBulletin which only occurs on forums with subfora. The forum is being marked read for you, but the page is not refreshing. If you hit refresh, the forum will properly display as 'marked.' As this is a vBulletin bug, there is nothing I can do about it until the software is patched. vBulletin have been aware of the bug for a year and a half, but have not yet fixed it so I wouldn't hold my breath for a resolution anytime soon.
Ah yes, I'd forgotten. Sorry to have wasted more of your time.