ASObjC Explorer has just been updated to version 4.1.17, with fixes relating to Sierra. Choose 'Check for Updates...' to update.

Note also that ASObjC Explorer is no longer available for general sale. Barring bug-fixes, this is the last release -- there will be no further development. You can read more here:

http://www.macosxautomation.com/applescript/apps/explorer.html

Registered users are eligible for a 50% discount on Script Debugger 6 until mid-November as compensation, and should email Shane Stanley for details.

Development of Script Debugger 6

Its AppleScriptObjC code completion will be familiar to users of ASObjC Explorer, but goes further. And Script Debugger 6 ability to step through scripts and explore Cocoa results, to the point of being able to explore the contents of collection classes.