Not sure, but it seems to me that you need to switch to the cues page to validate your edited grid.
Beatgrid change not permanent in Performance Mode
with Beta 4 in the grid change will not apply with the lock button.
When I change the position of the red bar to change the grid, it will change temporarily. When I for example hit the lock button, the grid is again like before the change.
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We believe we could fix the issues you reported to us.
Please try the BETA 5 from the following link?