Recently active topics in twitterfeed tagged with custom domain

Can't get the rss feed from my blogger account to parse. It's not the standard blogspot address. It's a custom domain. When this same feed is entered into any other rss reader, it works.

feed://blog.jon-allen.net/feeds/posts/default?alt=rss

(Just for the record this is a great service! Thanks for all your work on this)