Oddly it's working again today. Not sure why I posted in this thread instead of making a new one (oops).
The broken saved session there happened when I used create session while in the middle of one of the bugged sessions which wasn't recording any kills, and it happened a few minutes before I made that post.
edit: No error message, was just showing connected. Also today my sessions are working but the session timer is still stuck at 00:00:00:00.
The session timer on the main form is bugged currently, the in game session timer on the HUD should be functional