iClone no longer loads custom plugins at startup

iClone 8 does not load the custom plugins located in
'*:\Program Files\Reallusion\iClone 8\Bin64\OpenPlugin" when it starts up.

I’m not sure if I accidentally set something up incorrectly, or
if newer versions of iClone behave differently and don’t load from the usual folder.

My plugins are in the folder you mention and they do show up. Are you saying none of the plugins are available?

Be aware that some plugins don’t have their own menu item under Plugins but can be found under Plugins => Python Samples: