Okay, so...the new breeds and a few of the private/custom breeds are not showing up on the drop menu when I go into the "management" link and try to use the "Search My Horses" function.
As it stands, when I want to locate my American Shetlands or my Gaited Mules, I have to go to the public "Marketplace/Search Horses" option, and sift through every individual of that breed to find the one I want. Total pain in the butt and I can see it being impossible once there are more than a dozen or so of either breed.
I think some of the other new breeds and custom breeds are missing from the "Search My Horses" drop menu, too...but I'm not sure.