Thank you, this worked! Also it was only one vessel that had 2 probe cores doing it. I thought they were faced correctly but maybe they weren't. But the problem has gone away on subsequent vessels so thanks again and I love the PCR I've been flying unmanned rockets there exclusively!
I did have a question, at the PCR main control desk, there is a switch I can't see what it does, the desk overhang occludes it. It has start and stop labels and is right next to the electrical charge meters, can anyone tell me what it is?