Hi Guddu - that last thing is not an error, just a hint. You should allow to recreate the signing certificates, then that message will be gone. It concerns the signing certificates only, not the encryption certificate, and it should have no negative consequences. After you allowed the recreation, you should probably also create a fresh backup of your config and certificates, to use from now on.
I left the server running all night but the DKDM ingest has not moved any further. Still remains at 0% computing digest. Could it be an issue with the test version?
Since I have a DKDM specific to my installation, I cannot recreate the certificates. That's why I had to copy the certificates from the existing install (on which I couldn't have installed the Test Version) to this new server ( on which I am testing the Test Version as it has the PNG subtitles related changes).
Guddu - you have to read carefully - only the encryption leaf certificate is criticial for your existing DKDMs/DCP to work.
The mentioned signing certificates do not break your encryption chain. Only these are recreated when clicking 'Recreate Signing Certificates'.
That said - I am sure that this doesn't solve your issue.
First thing would be to step back to an older version of DCP-o-matic to see wether that fixes your issue.
The first one is from the Newer version. Look a the diagonal bar of N for example. I think i do not need to test this in Cinemas as that pixelating issue is clearly seen here.