Definitely, something is breaking the connection to at least one driver, etc when I power down my UAD Apollo. –I suppose that's a version of hotswap. Even now on Titan Ridge, nothing has changed except that I can use both TB ports. I am skeptical that TB hotplug will ever be fixed, given the number of people that have been working on it. It'll drive you nuts. If KGP couldn't fix it, I doubt it'll ever be. Not being negative here, just practical so that I can work and not have this issue nagging my brain. If someone can truly solve it (as in YouTube proof) you win the insanelymac nobel prize in computer science.