Compressor Freezing

Compressor is freezing on both my iMac and MacBook Pro. I'm able to load multiple [H.264] files, anywhere between 10-70, but as soon as I drop the new codec [Apple Pro Res 422] on it freezes, before Submitting, and I'm forced to Force Quit.

I downloaded "Compressor Repair," but it didn't solve anything.

I've used Compressor very often for years and this has never happened.

Can someone please tell me what's going on? How can I fix this?

Thank you.