Thanks for the hints.
Yesterday I logged in, played a few hands and the problem was still there. So I closed PokerStars Client and h2n, moved logs folder somewhere else, launched poker soft and the tracker again and... everything worked fine... no idea why - I'll keep an eye on it and be sure I will keep you updated.
The only thing I've done differently than usual is that I played a few Spin&Go games before moving to cash games.
I still have the old logs folder, so if you want it, I can send it to you.
Thanks for the reply, I just finished trying to reset the settings to default in the game types tab and then went to clear stats>build stats. Unfortunately, I still have the same issue when attempting to rebuild my stats. I also tried to fix the issue by using a smaller database with 3 million hands, but this also didn't seem to solve the problem. Is there anything else I can try to fix that might fix this issue?
You made a mistake in the stat name 1st raise BTN. The correct name for this stat is 1st Raise BTN. Therefore the correct Expression string looks like this:
Value(4bet BTN vs BB,SB)*Value(1st Raise BTN)/100