'Forking" between score and parts - parts do not match score

This has been an ongoing issue for me since switching to MS4 from MS3. Changes that I make in the score do not always get reflected in the individual parts. For example, if I input a bar with a half note followed by a dotted quarter and then an eighth, I can check the part and it will be correct. If I then change the dotted quarter to another half note (overwriting the eighth at the end of the bar), it will look fine in the full score, but the part will still show a half, dotted quarter, and eighth. If I delete the parts and then regenerate them, they will again match the score, but I lose any formatting (system breaks and page breaks) that I've added to the part. I've had similar issues with deleting rehearsal markings in the score, but they remain in the parts.

I had manually corrected the errors I'd been dealing with, but I reverted this score to an older version to demonstrate the error. In the attached score, measure #265 for the Tenor Pan has a different rhythm than the corresponding part for the tenor pan.