Even though it's been a while since you posted this question and you supposedly have found some solution, I'll answer for the benefit of others with the same problem -- as myself, when I installed InDesign CS6 for Mac yesterday.
When I pressed cmd + shift + hyphen, the Help window popped up. It turned out that the system used the same shortcut to open «Help». Here is the solution:
Go to System Preferences.
Select Keyboard Shortcuts.
Select Application Shortcuts.
Disable the shortcut for Show Help Menu.
Restart InDesign. Voilà!
[Moved the discussion to InDesign Forum]