A blog that I maintain at work is changing themes due to 2.3 breaking the category search. We're in the process of trying to find a new theme to customize however we are coming across some huge issues with flash. In particular, flash video and audio (using FLV Embed and Audio Player plugins) are not being displayed. This is something that only occurs on the main page, and when doing a category search. If you go directly to the posting, we'll see the video.
I have found a site with a similar situation. This is NOT the site that I am working on.
If we use the default WP theme, this issue is not present. In our old pre WP 2.0 theme, there are no issues. Only in certain newer themes. Currently I am trying to get "Your Content III WordPress Theme" to work. For comparison, the theme "Charcoal" works perfectly, but contains too much to be used by us.
Any help on this issue would be appreciated, and I'll provide more info as requested.