I can no longer Copy / Paste in Word,Powerpoint/OneNote Online ... However, I can Copy/Paste in Outlook and Excel Online.

I am using OS X 10.10.3 / Safari... 

Hi,

I'm using IE in Windows, everything seems ok on my side.

As you are using OS X, I may not be the best resource for this issue, since I'm not familiar with this environment.

Anyway, you may learn something from this reference below:

Copy and paste in Office Web Apps

Regards,

Melon Chen
TechNet Community Su