Same problem here. I checked the log file and there was an error with a non existing private.key file. I added the private.key and now I can add a layout:
The path "/home/xxx/public_html/xxx/web/xibodata-v4/certs/private.key" does not contain a valid key file
I have never had to put in a certificate file with my updates. is this just general private.key file? if not how do I generate it or where do I find it?