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Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
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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.
2014-08-03 10:23:48,960::INFO::[__init__:941] Loading data for Rating.sab from /home/sander/.sabnzbd/admin/Rating.sab
2014-08-03 10:23:48,960::INFO::[__init__:944] /home/sander/.sabnzbd/admin/Rating.sab missing, trying old cache
2014-08-03 10:23:48,961::INFO::[__init__:947] /home/sander/.sabnzbd/cache/Rating.sab missing
sander@flappie:~$ ll /home/sander/.sabnzbd/admin/Rating.sab
ls: cannot access /home/sander/.sabnzbd/admin/Rating.sab: No such file or directory
sander@flappie:~$ ll /home/sander/.sabnzbd/cache/Rating.sab
ls: cannot access /home/sander/.sabnzbd/cache/Rating.sab: No such file or directory
sander@flappie:~$
2014-08-04 20:04:41,031::DEBUG::[rating:215] Updating indexer rating (358a9dcvblablae1e6540eblablaf1)
2014-08-04 20:05:34,583::INFO::[__init__:917] Saving data for Rating.sab in /home/sander/.sabnzbd/admin/Rating.sab
2014-08-04 20:05:38,148::INFO::[__init__:941] Loading data for Rating.sab from /home/sander/.sabnzbd/admin/Rating.sab
So this feels like a bug: SAB tries to read the OZnzb rating file when it doesn't exist.