Then you probably should consider re-installing Yosemite or Sierra (10.12.). AFAIR, I left out High Sierra because of the many reported issues.
True. I am scratching my head as to why this TI plugin doesn't play nice with my system, but works for others. I have seen some previous posts about doing a fresh install, but not sure why you would have to go to that extreme to make devices play nice with each other. I have an older version of Pro Tools 9 and a few other older versions of software on this laptop and you can't re-install on Yosemite or Sierra, as far as I know. Doing a fresh install isn't out of the question, if that would fix this issue, but thats extreme, at least for me. I would loose some software, but would gain a working TI plugin, possibly. I have also thought about installing the previous TI version to see if that works.