I also have this problem and the forced refresh did nothing for my firefox. If you have directions for clearing my cache I would mind trying that. But that annoying issue is definitely present for me as well.

There we go, smaller text stops it.

I wonder if a well placed '<'br'>'wouldn't fix it for all text sizes?

Edit: New problem lol, now I can barely read the text on the page >< 

Ahh Ioi I do have my text size increased. Maybe thats it but now, nevermind. Because for some reason, as of today.....Its not pushing stuff over anymore. Wierd as hell but hey. Its working.

 Very true about the increasing text, but I think the culprit is actualy a combo of resolution and monitor size.  At normal text size the problem was still there, but I am using a 22 inch widescreen in 1680x1050 with windows set to display at 120DPI.  In that regards I am not exactly the normal.

 I promise I wasn't trying to be difficult in saying it was hard to read.  Literally the largest text size that the problem stopped at required me to move close and squint to read. I have perfectly normal vision (no glasses/contacts etc) and the text size on this monitor looks the same as it appears on my second monitor (with normal settings). Now if I thought it had just been me I wouldn't have even asked for a change, but there were a few others etc.  So I truly do appreciate the fix you implemented, it now works (and looks) perfect even at my extreme settings.  

 PS - I actually tried to edit the title of this thread after I posted it realising it sounded a bit harsh, but was unable to =P

it's working now, thanks ioi!