I think this started in version 2.6.x. I am personally seeing this strange behavior using Firefox version 3.6.13 (windows) to view the textpages on my site. The behavior is completely random and I have not been able to reproduce it on demand, but it happens quite frequently. Here's the problem.
If the text page is longer than the browser window, then normally the textpage will appear, being displayed at the top of the page, and it will have a scroll bar. Now, since version 2.6.x, my textpages are appearing with the page centered (not starting at the top but in the middle of the page) and they do NOT have a scroll bar. This behavior is making the textpages completely non-functional and some of my website visitors are asking why they can no longer get these pages to work correctly. It's really hard to read a page from the center out, especially if you can't scroll up or down.
I hope you can reproduce this strange behavior and fix it - Thanks