I just had this or a very similar problem, and it's a real showstopper for version 6.10 for me. I'll keep it up for a little while in case I get a quick reply asking me to check something.
The trigger for me was an internet outage. I know because I use NetWorx to monitor my internet bandwidth and suddenly my upload and download bandwidth went to zero. Here's the screenshot:
I get maybe up to 5 of those a day, they usually auto-reconnect after 3-5 minutes. It's a very rare day that I don't get any such outages. The green is download bandwidth, and it's short at first where just the P2P app is running, but the green bars get much taller when I start the Newsbin download. Then you can see both upload and download bandwidth go to zero. Either that was the trigger or it's a huge coincidence.
Once the internet connection reconnected, my p2p application automatically resumed (as you can see in the graph), but nothing happened with Newsbin, and I mean nothing. The log file just stopped logging, at least there are no messages in the logging tab after the internet connection died (Edit: At least there weren't for 2 hours, see update below).
Versions 4 and 5 dealt with this just fine. They would keep trying to download, and I'd get connection failure messages in the logging tab, and they would fail the parts after retrying so many times. Then when the connection came back, if the outage was long enough, I'd have some failed files or parts, but it would resume. Then I would just go to my failed files list, and add the failed files back to the download list and everything was fine.
I looked at newsbinpro64.exe in my task manager (using the 64 bit version on XP64 if that makes a difference) and it looks like it's still "running" as every once in a while I see the CPU usage column flicker from 0 to 1%, and it's using 133 megs of memory.
It's kind of like it just died, but it's definitely not locked up because I can type a search term at the top and it will parse the headers to the search term.
Anyhow, I don't think I can switch to version 6 until this problem is fixed. But it was doing well in my testing until this happened.
Whether you can duplicate this by unplugging a network cable or not, I don't know, I haven't tried.
I suspect restarting will probably get it going again just fine, but I don't want to have to restart. I prefer the way version 5 works where no restart is necessary.
I saved screenshots of the Newsbin screen and the log file, but the log file is useless since it doesn't show anything after it stopped working. Anything else I need to check before I close it down and restart?
I did check the main pause button, and it looked unpaused (and the symptom is very much like pause), but just to make sure, I clicked it, watched it turn yellow, and clicked it again to make sure it's unpaused (the yellow disappeared). It's like it paused and won't unpause but the pause button isn't on and none of the parts look like they are paused, I see green everywhere on the download tab, like it's still downloading.
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Upadate: I left it running, and almost exactly 2 hours after it stopped, I got a popup window of critical error messages which also appeared in the log. Here's what the log looks like:
[19:18:45] HIGH NNTPSocket - ARTICLE <48a3071c$0$33699$892e0abb@auth.newsreader.octanews.com>
[19:18:45] HIGH NNTPSocket - 220 0 <48a30702$0$33699$892e0abb@auth.newsreader.octanews.com>
[19:18:45] HIGH NNTPSocket - 220 0 <48a3070f$0$33699$892e0abb@auth.newsreader.octanews.com>
[19:18:45] HIGH NNTPSocket - 220 0 <48a3071c$0$33699$892e0abb@auth.newsreader.octanews.com>
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:51] ERROR Socket - Error: WSARecv Socket Error Code: 10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[21:18:51] ERROR NNTPSocket - Server:news.giganews.com NNTPServer: Timeout - Waiting for Server to send Data: Socket - Read or Write Timeout
[21:18:52] HIGH NNTPSocket - MODE READER
[21:18:52] HIGH NNTPSocket - MODE READER
[21:18:52] HIGH NNTPSocket - MODE READER
[21:18:52] HIGH NNTPSocket - MODE READER
19:18:45 corresponds to the time where the internet connection was lost. The connection was restored automatically and the P2P app resumed at about 19:22. And Newsbin went into the "twilight zone" for 2 hours, and started running again at 21:18! Very strange! I can't think of anything I did to get it started again, it seems like it just decided to restart on its own, after taking a nap for 2 hours.
On the plus side, it didn't actually fail any files, it picked up right where it left off!