Just want to update everyone, as I’ve seen this issue posted prior with no answers.
The problem was my admin account (which I send “test” messages to) somehow got switched to ASCII and not HTML newsletters. I recall PHPList always sending two copies, one ASCII and one HTML when testing, but maybe I’m either crazy or that feature was dropped.
That said, I figured out that once I turned my email to HTML, it would receive it properly.
I feel dumb now, but am posting this here for others who may run into the same problem. Again, I recall PHPList once sending TWO test messages prior to running a campaign. That feature seems like it should get recalled