I really like the new usability improvements! Let me mention just two thoughts.
1. Possibly, on the Stats page, under problems correct/problems incorrect show total problems attempted? Saves me doing a mental addition

:-) This was easy to do so I've just uploaded this change.
2. Total time logged in (as shown for instance on this page right now) says 54 minutes; I know I've only been on around 10 minutes at most. This number always shows as pretty high. But maybe it's because I don't log out in between sessions so it is my fault

Unfortunately the forum uses a different idea of sessions to the rest of the site. It is a third party application and the integration with the rest of the site is not great. One of the things I'm looking at is much better integration between the forum and the tactics. An ability to embed the PGN Viewer directly into forum posts with either arbitrary PGN or the actual tactics positions seems like it would be very useful. This is a bit more of a long term task at the moment though.
Thanks again for a great practice site. I just played a tournament this weekend past, and gained about 65 USCF rating points! It is working!
Very happy to hear that!
Regards,
Richard.