Thanks for asking!
Right now, the current stable version of the plugin is using an older
way to access the FeedBurner Awareness API. The older method cannot
access <
feed2.feedburner.com> URLs.
The current experimental trunk build of this plugin has been updated
to a newer method of accessing the API. I don't recommend installing
the trunk build of the plugin yet as it has not gone through any
testing. In a week-or-so, there should be a new stable version that
will work with your feed. I will notify the list when it has been
released.
Thanks again,
Jonathan Wilde