Just got around to upgrading everything tonight.  Followed the standard upgrade path/procedures.  Everything worked great, until I noticed the post count for each user was 0 and no avatars/sig's were showing up.  Checked out the table and it's storing the data and even incrementing the post count appropriately.  It's just not displaying it correctly.

Known issue or did I not do something correctly?

I'm experiencing the same issues with showing the number of times a user has posted. I've tried this on 3 different clean installs of DNN and on 2 different servers (W2K Advanced Server - my own) and all the same results.  Everything seemed to install perfectly - no errors, but I it shows 0 Posts under the user name on each message and also when you click the user name from a post.

If I login as admin and choose manage forum users, the posts column does correctly show the number of posts each user has contributed.