Hi, Jim.
I'm terribly sorry for the delay but I've had some mishaps lately with my Windows system and (still) switching to linux the last week and haven't checked my rss reader for a while.
Generally for such troubles you should have used the contact form. It's more probable that your request will reach someone and get response withing couple of hours (with the solution).
So the problem with your urls is that at some point got redirected to
http://www.instantimprints.com/blog/feed/
and the new url must be entered into the tracker (automatic redirection off currently for testing purposes).
You could have fixed that with the [update] link (I've done that for you already).
<channel> :: <item> elements must have <pubDate> sub-element."
> That's outdated from when the feeder didn't support the atom format. I'll remove that as soon as I have the chance.
For more informatin about how Blog Feeds can be used effectively, see:
> That's just a beta stage wishlist feature :) yet.
Regards
Daniel