I'm a bit more skeptical that your issue is related to a particular file or files, if that one is new (because it didn't seem to be trying to background-parse any files, and wasn't trying to re-import the same file both times, which would be typical for that kind of problem).
My main remaining idea is that it is Media Network related, and relevant to that unable to bind error. That doesn't seem good.
Can you try turning off Media Network entirely and see if you can reproduce the crash? I realize this isn't a solution (it looks like most play controls are coming in via that mechanism), but it would give us a place to target if it goes away completely afterwards.
And, do you have any kind of other security software, or group policy settings, or anything else similar that might be blocking MC from being able to grab the port to accept incoming connections on it? Are you trying to share this port with another application on the same system (perhaps accidentally with some file sharing application that sets a random outbound port or something)?
Did a lot of stuff tonight, and don't want to do too much at once because when I get this thing I want to know exactly what it was. So, before I address your concerns I will list what I did.
Tested my drives, all three of them , right down to sector scans. No problems.
Totally disabled real time scanning by MSSE
Totally disabled firewall, not that I really suspect that
Verified that I had properly disabled windows search and indexing. To do so I had to do it with the Windows "add remove windows features"
Checked all my power setting making sure drives were not sleeping, ever. Did this at the driver level too.
Disabled media network (saw strange activity, more later on that)
Removed a huge portion of the library
Disabled auto-import library
Verified that critical hardware drivers (chipset) were latest/proper version
I had media network disabled for most of my trial, but I enabled it a few days ago so I could remotely manage my library. I don't need it while I troubleshoot so I gladly disabled it. When I did I noticed constant activity in the log. Something I need to look into still. Anyway media network is disabled and tomorrow I will uninstall MC from the other computer just to say I did.
Not sure what port MC is using. Never set it, so whatever is default.
I have no file sharing software on this PC whatsoever. The only thing on this PC is Windows and J River with the exception of a couple utilities and Chrome. Even the Windows install is virgin , not preinstalled, OEM, bloat ware loaded.
Lets see what happens. I'm determined to figure this out. Every time you chime in I am thankful. I truly appreciate it. Tomorrow night I will investigate the media network strange activity and look into the status of that port, etc.