The second, non-working download does shows 3 connections (max for that server) on the connection page. The connections don't refresh on that page (also not when refreshing the page manually).
Pause/unpause has no effect.
In the queue it says "94 MB 94 left, 0:00:00 left, unknown"
And while I was writing the above, the downloads starts
, about ten minutes after it was added to queue. Here is a part of the logfile (from the end of first download to start of second download): http://pastebin.ca/1086576
Is it a server problem? If I restart sabnzbd, the download starts instantly. Strange...
By the way, I'm downloading from the same server (on OSX) and don't experience this issue.