Mozilla 1.1 has trouble displaying certain images: The image “http://here/myimage.jpg” cannot be displayed, because it contains errors.
Also, if you have more than one screen of information in Opera, your content will sit stuck on the status bar- no amount of padding in the body or column div, and no amount of margin space to the last element or item will change this...
IE works- Mozilla reacts the same as Opera, so I'm guessing they're correct in their rendering.
I have both browsers and cannot duplicate what you're saying.
As far as Opera goes, are you using an older version? I used to have some problems in v5 with absolute positioning, but that's gone away (or perhaps it's because I stopped using some of the techniques because of this).