Ok, now I'm really confused -- I installed 1.2.1 and ... my custom stat blocks are working fine, both character and monster. I don't know what was going on with yours but I'm not having a problem!
Sorry to be the source of confusion for anyone Eric. As I mentioned above You had already helped me fix this.
I had changed the names of the original statblock files (added the word "Original" in its name) so it was a super easy fix once I understood what had happend. Thanks again for the help and sorry to have troubled everyone over a dumb mistake like this.