I too have the HTC 8X (since today)
and zooming works perfectly on main page/articles and forums. I almost posted this via the HTC 8X but saw I can't attach screenshots.
Here's a pic with a lot of zoom-in on an article that has just gone up.
I have upgraded to the latest WP8 version (8.0.10211.204) only a few days old?
I have Do not Track disabled
Using stock IE10 on WP8 (no other settings change)
Worked logged in and out.