You don't want to delete all rules. Altium requires a rule to dictate the behavior of the planes. When you go and re-pour a plane, it defines the plane from the rules. You will want to make sure that Your Plane>>Polygon Connect Style rule is properly defined. You will also want to make sure you have your electrical clearances properly defined. Interesting issue though, I am curious what the actual problem is. If the design isn't proprietary or confidential, you should share the pcbdoc so i can play with it.