It looks like the recent update changes the way images for the video thumbnails are embedded and one is seeing image tags with no protocol specified, i.e.:
We have our feed sent out through feed burner and everyone who uses outlook 7 is finding that our emails do a hard crash of outlook because outlook interprets that double slash as pointing to the local server. Yes, I know this is a problem with outlook, but it the "no protocol" solution does cause problems with many rss readers too. Is there a way to have a checkbox that just uses http: or https for image embeds?