Theme Builder

Hi, I am upgrading from Confluence 2.5.1 / Theme Builder 2.0.9 to Confluence 3.1 / Theme Builder 4 RC.

When I compare the content side-by-side there are a lot of visual differences. The page titles are rendering in a different font size and font, and the headers (h1 to h6 etc) are also showing up differently. I have looked at the custom CSS sections and don't see any place where overrides were made in the old version, and I can't see how to adjust these in the new world to match the old.

I found the place where custom CSS can be put for a given theme but it doesn't seem to be having any effect. What changed, why, how can I see what it used to be (actual settings, not visual display), and how can I adjust the new world to match the old (where I prefer the old)?

Thanks,
Eric