Bugs in the CSS

I’m currently trying to track these down and fix them - no luck so far
# The text formatting of the section headings on the right menu doesn’t work or show in Opera 7.11. Why this is the case I haven’t a clue, as Mozilla 1.4 shows it perfectly (albeit not using my first choice font, while IE 6 does use it…)
# The background colour of the post titles on the front page doesn’t show in IE6. Is this a limitation of the browser?
# Obviously the links on the top navigation bar should be centred vertically in the grey bar rather than in their current position. The post images (which don’t show in IE6 as they are generated content) should also be centred vertically. Do you know how to do this? I’ve run out of ideas and attempted everything I can think of, including the method I used for centring the text in the section headers on the right menu (see point 1)