Processor InputRequirement indicating invalid when it should be valid

I had connected several processors in a line and had them all valid and ready to be started. I then decide to remove one processor from the path, so lets say I had Proc1 connected to Proc2 connected to Proc3. I deleted the connection between Proc2 and Proc3, then dragged the existing connection between Proc1 and Proc2 to make it go from Proc1 to Proc3. At this point everything should have been valid, but Proc3 said it was invalid because it required input. If I deleted this connection and created a new one between Proc1 and Proc3 then all was good.