Power cover oddity.

[Darren Donovan]

When I want to go back to a previous web page, I always hit Alt + Left Arrow. With the power cover, it turns the web page from landscape to portrait orientation. Alt + other arrow positions alternatively rotates the screen through 90 degrees, 180 degrees, 270 degrees,... I'm using Chrome browser FYI. How can I go back to a previous web page, without using the Back Arrow in the Menu bar at the top? This never happened with the Type Cover.
Thanks,