Unable to reproduce on my end (yet)

Version: 3.1.13 build: 2597 3.1.14 without python support, compiled using QT 5.4.1 Running on QT 5.4.1

P.S. Do we have a version number out of date somewhere? Or am I testing on the wrong build?

Looks that version number is wrong. Did previous version work ok?

In case there's any confusion, I used the Huggle (3.1.14) for Mac OS X link found on the Huggle download page. It is the fourth one down and a direct link can be found here. I removed Huggle from my system and downloaded it again to confirm that I am still receiving an error, which I am.

Did you ever use any other version of huggle on this OS which worked?

The problem here is that huggle can't download stuff using internet, OS is somehow blocking its network access it seems.

Yes, I have used previous versions of Huggle on this operating system and computer. I haven't used Huggle for quite some time, but I know that I haven't set anything to block it on purpose. Perhaps a security setting on OS X is blocking it by default? I am not sure.

Can you try install some of the previous versions? Do they work now?

Keep in mind that you must use SSL since now

If I check "Use HTTPS (requires OpenSSL)" I am able to login just fine; however, if I do not check it, I receive the error posted above. Out of curiosity, if SSL is required (and not using SSL produces errors), why are users given the option to choose whether to use HTTPS or not?

They are not, if you wipe you config it will no longer allow you, it's
recent change of config that forbid users from using non ssl on WMF
servers. You still have configuration from previous time when it was
possible.