It's been a while, so after reverting back go 6.6X for a while (and having almost no problems in that department) I have upgraded again to 6.73RC2. I'm running on Windows 2003 (equivalent to Windows XP).
The problem is still there - I have some completed downloads that are stuck without being unrared. Note that not all items get stuck this way, things that automatically download appear to be working fine.
From what I can see, both items that I have stuck in out download folder were both passworded NZBs that were originally put there using the watch folder.
If I check, the files are all there and they may have been repaired (I can't tell if they were or not, but multipar runs fine on them).
At this point, if I right click and select unRAR, it does unrar them successfully. From what I can see in the logs, the autoPAR reports that the repair failed and the software doesn't continue on to the next step of unRARing. From what I can see either the AutoPAR stage does not work correctly or doesn't report that it's working correctly...
How can I help you guys diagnose this issue? It seems like it's been there for a while and I would hate to downgrade back down to 6.62, which works fine.