I'm the one who made the original post and feared the worst based on all of the reports (mostly from people using pre-2018 software). I took the plunge over a week ago and installed High Sierra, and then installed the updated CC 2018 apps. I have not had one problem. Not a glitch, not a crash, nothing so far. Since this is a short week, I will really be taking these programs through their paces now through Wednesday. Again, I'll immediately report back if there is a problem, but so far, nothing. I'm using a late 2015 5K iMac Retina with an SSD (which is the only type of drive you can currently upgrade to APFS). I even had concerns about reading from an external drive, as many of us do, but there have been no read/right concerns there, either. Even when copying from the old format to the new and then opening, or saving to the new after opening from the old. Not a bump. Crossing my fingers I haven't just jinxed myself. 🙂
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