Do you experience problems during downloading?
Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
We will probably ask you to do a test using only basic settings.
Do you experience problems during repair or unpacking?
Enable +Debug logging in the Status and Interface settings window and share the relevant parts of the log here using [ code ] sections.
I just upgraded from SAB 1.2.3 to 2.3.0, and noticed I needed to install SABYenc 3.3.1. I followed the directions on https://sabnzbd.org/wiki/installation/sabyenc.html, and it looks like it installed okay. But then I think it may have installed on the wrong python version: