The plugin renaming is a general deluge issue which the official installers always had whenever updating its backend python version, so just wanted to clarify for people reading this that it's not something that I introduced. I didn't have to update python of-course, but there where fixes that both affected stability and performance, plus I prefer using newest stable of everything possible. I did mention the issue on first page too, but understand not everyone re-reads that of-course, after the first time read, but I continually update it(114 times as of now, lol - I believe though I'm slightly OCD too

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Yes, considering these installers beta is accurate, I'd agree, and no offense taken the least

I appreciate the feedback also.
Here's libtorrent bug report:
https://github.com/arvidn/libtorrent/issues/4529
And following that, deluge's:
https://dev.deluge-torrent.org/ticket/3384
Libtorrent 1.2.3+ changed the way they announce to trackers and bind to interfaces, to be multi-homed I believe(tries all interfaces found which supports incoming connections, which wasent like that previously). In those versions you often see a tracker showing as error, and if checking the tracker tab at the bottom, then states as status: "The system cannot open the device or file specified ". It sometimes goes out of that error state some time later and then returns again later. Checking debug logs show some announces succeed and others don't, and as lo is one of the interfaces checked, then that will obviously fail, as no outgoing internet acces possible for lo of course. This is therefore I included 1.2.3 for people either annoyed of that error showing, or don't know this and thinks it's an actual error(like myself initially too), though I mentioned it too on first page when found out. It sounds like your issue is different though, but would be nice if you could test it again, thanks.
Btw, I added a shot at end of post showing issue with trackers in deluge with libtorrent 1.2.3+, and here where using VPN and libtorrent 1.2.6. Hmm, come to think of it, i'm now coming to question if deluge actually is doing something wrong or not with showing that error. I mean, as Arvid said, it shouldn't list tracker as in error, if only one of the announces fail while others doesn't, but does deluge do that here in GTKUI? I'm not used to GTKUI, and so don't know if it means the tracker is in error "fully", or only one announce was in error and others not(which would be correct way, if even listing the error at all, i'm not fully sure if even should do that, but atleast should signal that it's still working regardless, which i'm in doubt about if already does)? Anyway, I have submitted a bug-report as said to deluge bug-tracker, and if wrong, then it will just be closed without further fixing needed of-course.
Anyway, you can manually change libtorrent's out, by replacing/renaming back and fourth. The relevant file for this is 'INSTALL-DIR/Lib/site-packages/libtorrent.pyd. If you ever get an issue starting deluge after changing libtorrent version, then it's an old deluge bug which can be fixed by deleting session.state in your deluge profile-dir.
Edit: Will update with download link shortly, of zipped-up archive of the three provided libtorrent's from installers, as wrote above not on computer.
Edit2:
http://s000.tinyupload.com/index.php?fi ... 0891994268