See post #2 for an illustration.

.....

The opt-out should be by default.

Yes, I do find it mind numbingly insular that people think "oh I have a great idea so let's make everyone have it, they'll love it too".

This is probably the worst implementation I have come across on this site to date. When I use the back-button on a thread (this is desktop or iPad viewing in normal style) it goes into an infinite loop and doesn't actually go back.

What ever is the purpose of this? If using on a tablet, it is completely superfluous. On a normal desktop with mouse it is largely useless.

Hate it! :(

But thanks FT for allowing me to disable it (as explained in post #2). Because of that, we're still good... ^ :)

Here's their answer in the other thread on opt-in:

http://www.flyertalk.com/forum/27788362-post4.html

Also hate this new feature especially since it screws up my back button (apparently every time it scrolls it adds another entry to the back queue, at least in Chrome, making back button unusable). Opting out. I wish it would be opt in period since now if I browse without being logged in I'm stuck with this bad behavior.

This additional "feature" has been mentioned several times now but I think that the posts have been moved.

Edit: actually they are still there but I think other posts have been moved into this thread.

Agree with Pitflyer on this. This new "feature" completely makes it impossible to use the back button. Instead of trying to do both (infinite scroll and finite messages per page), in the option where you can select the number of posts to see per page, just add an "All" as an option.

For EVERYONE having trouble with the back button, two questions:
1. Are you using a mobile device?
2. When you click and hold "Back" in your browser, does it display as:
"Page 2
Page 3
Page 2
Page 3
Page 2
Page 3" (for example)

I don't mind trying new things, but having some problems with this (using Safari on iPad). Apart from the irritation when the page flickers as you get to the bottom, when I try to post using the reply or quick reply links, it always quotes a post in the box (not necessarily the last one). I'm not going to delete text every time I post. If I'm doing something wrong, please tell me, otherwise I will opt out until that is fixed.

1: Firefox 50.1.0 on OSX 10.12.2 on an iMac
2: It was showing the same thread for each but the page number was out of the box and I have now disabled the option.

I shall add their reasoning to my long list of either "well they would say that wouldn't they"....or possibly "you couldn't make it up if you tried". I am sure there are other better excuses for it.

I have always wanted infinite scroll (I hate pages), but am not seeing it on my laptop in Chrome.

ETA:

Ok, I logged out and back in. Now I can scroll down two full pages at a time (for me, that's 80 posts), but it will not go any farther. If I start at the top of page 1 I can get to post 80 by continuously scrolling, but then I have to select page 3, at which point I can scroll to post 160 but it again stops.

Maybe it wasn't tested in the scenario where one has selected more posts/page than the default, as I have?