I think this issue arose when upgrading from 1.16.1 upgrading to 1.18.0...
A user noticed than none of the "next 200" links work on my category pages
If you click on "next 200" it just goes back to the same page.
Tried to debug a bit myself, but I'm a novice in php. I did notice that the link leads to: http://fraternityofshadows.com/w/index.php?title=Category:Year&pagefrom=492+BC#mw-pages
yet the keyword "pagefrom" doesn't appear anywhere in my installation, according to a recursive grep.
Any way to fix this?