I've developed a WP 1.5.1 3 column theme at http://www.greatdealsforthehome.com and am having problems displaying banner ads between the posts in FireFox only (have only tried v1.0.4), IE is fine.
When you go to the site for the first time you should notice the first banner ad (in the middle column) is displayed too high and the second is also too high. In order to avoid flickering of the banners I had to wrap the banner html inside a ad-wrap div (padding: 0; margin: 0; height: 65px;) then inside a banner div (position: absolute;
margin: 0px 0px 0px 0px; text-align: center;). The flicking stopped after I added this style.
Here's the kicker: when the banners are displayed incorrectly I can resize my browser window slightly and FireFox redraws the banners correctly!
I'm a CSS newbie so any direction would be appreciated. BTW, I have validated my HMTL and CSS and all checks out OK.