Thread:Project:Support desk/Update previous MW 1.16.5 to 1.17.0 throws an 500 internal server error/reply (23)

Yep, I meant the usability initiative extension under 1.16 (the vector part of it).

Following your language files suggestion, I replaced the languages directory with the old one from the 1.16 install (since the links appeared correctly under the old install). This didn't work, the wiki pages wouldn't load at all because of some error in accessing a language file (not surprising).

But when I put the original languages directory back, what do you know but the page links were fixed and had returned to normal! Maybe this refreshed a cache somewhere? Now that I think of it, I don't believe I even tried clearing my browser cache, which could have been causing the problem (duh).

The only thing I've noticed now is that on the Special:Version page, it shows "" and "" instead of the usual text under License. That wasn't there before, but maybe an old version of that page was in the browser cache too?

I'll see if I can find the error log for more on that 500 error. Thanks to you both for the assistance!