I don't know what it is but version 4 is a total pain to get good beat grids in. First of all, literally every auto-loaded grid for my tracks are not right and resetting the grid never resolves it when that works 80% of the time in v3. And then when I try to make a grid manually it rarely works because it is like there's a latency where the click is off.
I have a gig in a couple weeks and thinking I'm going to roll back to 3 because of this. Really dumb