Minion is not acting normally on my Mac. I'm running Mavericks, fwiw. It loads fine, but doesn't update addons properly and installing new addons from Minion doesn't seem to work consistently either. Also, Minion won't exit properly. I have to force quit it.
What is it doing wrong when you update or install new addons? (Whats the end result that is happening in prompting you saying there is a problem). I don't see anything obvious in your config/log.
Also there is a bug where Minion will hang if you close it with any other method than using the [X] in the upper right hand corner of the app. This has been fixed in a release coming out soon(tm).