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.
Otgerwise disable all servers, restart SABnzbd, it should finish the jobs.
If that doesn't work: stop SABnzbd and restart it with the --clean parameter.
Other than that, I'm currently working on a way to force a job
from the download queue to post-processing.
I can send you a new source packet with that (preliminary) solution.