OSX High Sierra did a graphics update. Looking at my error log this looks to be the culprit. This could take some work on the part of the TC programmers. Given that TC for MAC is the lesser of the sales programs I don't expect a quick turn on this one. Regardless, I have forwarded my error log to IMSI and called them as well. Meanwhile, I will need to revert back to pre-High Sierra so I can use the program again. No big deal, that's what back-ups are for.