Comments Fixed, and Some Thanks
The issue with comments is fixed (turned out to be nothing related to Disqus, which was behaving normally), but the unfortunate side effect is that since things were misconfigured, a couple of comments are now attached to the wrong URL for the site and I can't seem to move them within Disqus' admin panel. In short, they're lost :)
So I wanted to thank Nicole for commenting to offer support and encouragement for my presentation (which went really well, incidentally), and I also wanted to thank SeedM8 for commenting about how to find where their servers are located (I did ultimately decide to stick with SeedM8 for my seedbox anyway, as they are suitably offshore, which satisfied the last lingering requirement I had).
So, er, yeah, comments are working again! This time I won't misplace any :)