My RSS feeds do not include post thumbnails, or any image for that matter.

I've searched around and can't figure out how to get the feeds to include the image. I'm guessing I'm missing something obvious, but I sure can't find it.

Thanks for any guidance!

I'll second this - my RSS icons in the header area seem to have disappeared, and I don't know why. I presume this happened on the upgrade to ATA 3.5.3, but I've only just noticed.

I'm on WP 3.0.1 & ATA 3.5.3

I've fixed this now - after a bit of searching, I found an old hack in the ATO/add CSS inserts area that changed the feed icons from ghosted to solid (see this sticky thread). This was looking for the icon images in the theme/images folder from an older Atahualpa version that was no longer present.
Changing the CSS text to refer to the current Ata version install fixed the problem - yay!