I am using Mathematica Online using Yosemite operating system (Safari or Chrome) and when I try to use the carat symbol () instead of the Power function it is not recognized, as you can see in the image.
I tried the same thing and the Power symbol “^” (shift-6) worked for me. I tried this in an existing notebook and a new one. Is there any chance that you’re using a language setting other than English? Or a special font?
You are right. I was using “U.S. International - PC” keyboard and when I changed it to “U.S.” the ^ sign changed as well, with positive results. See the image below.