Not sure what I did wrong, but after upgrading to 10.1, all Notebook computation gets routed to Wolfram Alpha. Proved this by unplugging network and putting simple command in Notebook, e.e. Graphics3D[Ball] and I get as error about not being able to connect to Alpha. What setting/configuration is wrong?
If I turn off access to the Internet, via Preferences > Internet Connectivity and then perform a simple calculation, I get:
The Wolfram Language is currently configured not to use the Internet. To allow Internet use, check the "Allow the Wolfram Language to use the Internet" box in the Help [FilledRightTriangle] Internet Connectivity dialog.
and no result
Just installed 10.1 myself on windows 8.1 - no problems so far. I uninstalled 10.02 first before installing 10.1 though.