This page is not created by, affiliated with, or supported by Slack Technologies, Inc.
While I still have no idea what the problem was, I'm now fairly sure it's due something with Heroku's uberjar build - pushing a jar to DigitalOcean appears to have eliminated the problem. Weird.
Yes, great when it works, but...
Just added test profile to re-frame-template. Anyone willing to try it and confirm that it works? https://github.com/Day8/re-frame-template/blob/master/README.md