Wow. I'm glad I found this thread quickly.
I've opted out of that annoying "infinite scroll". Pages flashing and jumping up/down, no ability to navigate thru large threads and the worst .... my "back" button doesn't work. After about 2 minutes on a thread, I can't "back" to the forum's index. My browser acts as if I've asked for the threads page dozens of times, so the only history I can go "back" is the very page I'm trying to get out of.
Using Chrome.

In the future, please don't make such large scales changes without a notification. I thought I was crazy trying to click to page 2, but getting the same page over and over. Perhaps a notification and go with an "opt-in" approach versus "opt-out" of something we didn't know happened.