Normally what you have to do if this happens, is just put your password back in, this happens if MW logs you out for some funny reason. If you have your password saved, just click relog, if not, put in your password and then click relog, and that usually fixes it.

Actually, it doesn't say "Aborted, needed token", it only spams the "logged out of MediaWiki" error. I thought that these two errors are closely related, since the image in the bug description also has a dialog box for the "logged out of MediaWiki" error.
Nevertheless, exiting and logging back in did not fix the error :(

Unfortunately, I am still hitting this error. I ensured that I am on version 3.4.12, which I downloaded, and it says I am on 3.4.12 when I launch Huggle. However, when attempting to add any page to a watchlist (Alt + X), I get the same error repeatedly ("It looks like you were logged out of MediaWiki for whatever reason").

I see, that must be very frustrating to try to fix. :( To clarify, I do not get the message Unable to login to wiki: Result returned Aborted NeedToken expected. Just the repeated dialog box.

Yes, this looks to be basically the same issue. Almost every time that I log in again, I get this spamming issue. Only once in a blue moon does this issue not come.

Note: This was due to a line in vector.js that attempted to hide bad images.