Okay, back. It wasn't the villains -- it appears to have been two things: One, I had embedded double quotes in several messages, which appears to have turned the double quotes that should have delimited them in the .storyarc file into semi-HTML codes. Plus, somehow HTML "br" codes were appended to the names of three of my mission goals.
Fixing all of these gave me the ability to test. Thank you for your help!