Hi @MarkAGregory,
Thanks for following up. When you say mpg, you mean the Mason Publishing theme, correct? That’s an OJS 2.x theme, and won’t work with OJS 3.x. For OJS 3.x, have a look for the bootstrap theme, and also consider the manuscript theme that we’ve recently added to the Plugin Gallery. OJS 3.x is also responsive by design, so won’t need as much theme work in order to modernize. I expect more themes will be popping up soon.
Regards,
Alec Smecher
Public Knowledge Project Team