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've install sabnzbd+, unrar, and par2 using the optware pkg installer on my WD My Book Live. It all works great as long as I run sabnzbd as root. I tried using sudo to run sabnzb+ under the account usenet (that I created). But sab can't find the Par2 files. I checked my path and permissions and I don't see any issues.
When I su to the usenet account I can find and run par2 just fine. Not sure what the problem is. The par files are not writeable but that should be ok.