Can I get more info on failure to initialize plugin on R8 startup?

After loading plugins on startup in R8.6, Rhino displays a message that there was an error loading one particular third party plugin. On pressing the Details button another message pops up, saying initialization failed. Is there any way to obtain more verbose information about the failure, to help diagnose the problem?

Not unless you are the publisher of that plug-in, in which case you can try to debug it from the code editor.