Hi
Since I installed macOS Sierra V10.12 on my IMac17,1 BaseCamp will not work. When opening BaseCamp as I close the Task Launcher the program shuts down and the message "BaseCamp Quit Unexpectedly" is displayed. I am running the latest version of BaseCamp: V4.6.3. Sometimes I can get past the initial Task Launcher before it quits, e.g. when selecting an existing route.
Previously to installing Sierra BaseCamp had been working fine. Of course it may be a coincidence that it has started crashing since installing Sierra.
I have tried the Garmin fix of moving the com.garmin.BaseCamp.plist to Trash and emptying the Trash can, but this had no effect.
Alan