Y/Pb/Pr signal on ATEM 1 Production Switcher not working

I have my cameras going into the switcher SDI and output Y/Pb/Pr. It's been working fine for months and all of a sudden the picture from the Component output is blue. I switched out the wire and have the same problem. I did notice that nothing changes when I put the Pr cable in. The Y works and gives me a picture. The Pb works and makes it blue. But the Pr doesn't register a signal.

Thank you for any help you can offer

Sounds like you need to actually call support directly on this one. Numbers are on the web site.