I accept my eyes are on the way out but I still don't think things are running as smoothly as they could be regarding the fonts and their sizes. Using default browser settings everything looks "normal" for me too, but I usually surf with Firefox (x1 text size increase) without problems, until now. On the old forum there seemed to be a default text size throughout, unless a user deliberately increased/decreased the text size or made style changes to it. Now I go from post to post, thread to thread, looking at different sized text. I've never come across this before. I have tried Explorer without any success.
I've included some screen shots so you can see what I'm seeing.
Here is what I see using Firefox default text size.
Here is what I see with x1 text increase.





