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.

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