I'm having this problem after today's security update to MacOS 12.12.6. I'm not even thinking about High Sierra right now. The app crashes almost immediately on launch. It's unusable at this point. The crash seems to occur when the app is attempting to sync with dropbox. I like auto-sync but I need to know how to turn it off if it prevents me from using the software. This issue was reported on 11/5 and it's 10 days later and no update is out yet? BTW, How would I go about downgrading to 5.6.0?