Zac,
I'm running into plugin loading issue. My exporter plugin is not loaded by premiere if I start premiere on my system. The log says:
Loading from disk...
The library could not be loaded.
However, when I d-click on .prm file itself, it launches adobe premiere pro and my exporter plugin. Here's a log for successful load:
Loading from disk...
This plugin was recognized by loader d3092dcf-904a-4a97-b4ca-66aed7540d57.
It says that Premiere Pro doesn't cache expoter plugins, so I think caching is not an issue, but I tried holding shift key while launching Premiere Pro to d-check that. That didn't fix it. Just an FYI - i'm building my exporter in debug mode if that matters.