I set up a job last week to deploy to Heroku and it is still working fine for deployment, however when I click 'Refresh App List' in the project configuration for the Heroku Deploy Plugin, I get this error message:
Failed to get accounts list for me@tylermauthe.com
So it seems that after some length of time, the Heroku plugin loses it's OAuth authorization... Or something.
I will dig into the logs further this weekend, for now just opening the ticket. If anyone else is experiencing this, feel free to comment with any info you can dig up.