1. If you are still having problems, open the Message Log (in the Window menu) and post the debug output on the support forums.
Pause your torrents
2. Clear the log and set it to 'Debug'
3. Toggle "Automatically map port" in Network Preferences
4. Post the resultant output
When I opened the log it was blank. Here is the answer to number 4:
2016-12-01 22:03:17 +0000 port-forwarding.c:180 [Info] Port Forwarding: Stopped
2016-12-01 22:03:19 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): initnatpmp succeeded (0)
2016-12-01 22:03:19 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): sendpublicaddressrequest succeeded (2)
2016-12-01 22:03:19 +0000 upnp.c:239 [Debug] Port Forwarding (UPnP): UPNP_GetValidIGD failed (errno 0 - Undefined error: 0)
2016-12-01 22:03:19 +0000 upnp.c:242 [Debug] Port Forwarding (UPnP): If your router supports UPnP, please make sure UPnP is enabled!
2016-12-01 22:03:19 +0000 port-forwarding.c:92 [Info] Port Forwarding: State changed from "Not forwarded" to "Starting"
2016-12-01 22:03:27 +0000 natpmp.c:75 [Debug] Port Forwarding (NAT-PMP): readnatpmpresponseorretry failed. Natpmp returned -7 (the gateway does not support nat-pmp); errno is 61 (Connection refused)
2016-12-01 22:03:27 +0000 port-forwarding.c:92 [Info] Port Forwarding: State changed from "Starting" to "???"
I would have posted the respective logs but txt and pdf formats were both rejected, to my surprise.
Your advice would be appreciated. Thank you.