Windows 8.1 professional.

If I'm on the Metro screen and start typing a program name or Windows utility, search brings up programs etc. that match what I type. Choose the program or utility I want, press enter and it starts.

This works fine for Control Panel say but if I start typing say devices to bring up the Devices and Printers option, while Windows displays the text for the option screen, if I press Enter the option does not start but instead either nothing happens or I get a Bing search result screen.

Can't work out why this happening since it works fine on another machine I use.

Anybody have any thoughts on this strange behaviour?

Thanks