Dates start flashing after updating another task's predecessors
I have a project plan that I am now updating to establish dependencies. Everything was going fine until I updated one task's predecessors and a completely separate row's dates (and associated span in the gantt chart) started flashing. I'm guessing that there is some circular logic or something that might be causing this because if I enter a different row as the predecessor, it stops flashing. But I can't figure out where the problem is. There is no error message or other indicators. Anyone have any idea how to troubleshoot this?