name='Nick R' said:The reason it happens is the post id isn't carried over when it does the login redirect. (I'm a vB Specialist xD) It doesn't happen on my 3.7.1 installation so it could be because your running 3.7.0.
name='Jim' said:Yeah I got to the bottom of it in the end. The $_SERVER['REQUEST_URI'] is reported incorrectly on IIS7 systems set up with FastCGI. It returns the page filename but not the query string at the end.
vBulletin have been informed, but as its not a fault at their end, I doubt they'll do any patches for it.