In Design CC2015.0
Edit > Spelling > Dynamic Spelling
If I uncheck Dynamic Spelling it does not turn off... all spelling errors are still underlined in red.
How do I turn it off?
This appears to be an issue with CC 2015. As part of the 'speeding up' of the drawing engine for the 2015 version, I've noticed many of the text adornments no longer update properly.
If you hit the space bar in some text and undo it, that should trigger a proper redraw of the dynamic spelling.
Thanks so much for the tip... It works perfectly. I was hesitant to trash my preferences.