Hidden Reload Extensions Command Crashes DW CC 2017 -- anyone else?

MacOS 10.12.1 Sierra

DW CC 2017, as earlier versions, supports reloading extensions with a hidden command:

   1. Make certain at least one file is open for editing

   2. Make the Insert palette visible by going to Window --> Insert

   3. Hold down Option key

   4. Pull down on select menu at top left, default shown as "HTML"

   5. Find and select new bottom item, "Reload Extensions"

For me, doing this reliably causes DW to crash. (Either immediately, when I attempt to continue working, or multiple 10's of seconds later, if I do nothing after step #5 above.)

Maybe I have a messed-up extension? (I copied my custom extensions from CC 2015, where they were all functioning correctly for the lifetime of that version.)  Any corruption or fatal error should be found at launch time,  right?   But I have launched CC 2017 dozens of times.  It starts up smoothly, without any apparent problem, and  I have seen that at least some of my extensions are successfully loaded from

     ~/Library/Application Support/Adobe/Dreamweaver CC 2017/en_US/Configuration/Commands

at launch.   Anyway, for test purposes, I emptied this directory, so there are no custom extensions to load at all, and the crashes occur just the same.

Anyone else?

TIA