I'd recommend to update to 6.3.2.
If I remember correctly, 6.2.1 still had some bugs regarding counting the replies of a threads with caused errors while displaying threads (Empty pages or posts weren't visible). This had been fixed in newer versions.
You can manually apply this fix to 6.2.1 of course. I did that for my board. Rick used a slightly modified version of my fix in the 6.3.x versions.
