Had same problem. I had the Wacom Inkling installed. You will need to remove that, or any other third party plug-ins and restart illustrator. Found this:
Solution
- In the Finder, browse to the folder that contains Illustrator plug-ins.
- Move all third-party plug-ins to a different folder.
- (Important)Press and hold Command + Option + Shift, launch Illustrator, and keep the keys pressed until Illustrator launches. This step clears all Illustrator preferences.
Caution:It's necessary to press the keyboard combination (Command + Option + Shift) in the same order as mentioned above.
- (Optional) If you require your third-party plug-ins when you use Illustrator, try adding one plug-in at a time. Each time you add a plug-in, ensure that you follow step 3 to start Illustrator.