Visor not working

I switched on the visor two days ago and it worked great. Yesterday it stopped appearing and the menu button to show the visor is grey. The shortcut is also not working anymore. I restarted my Mac and tried it again with the same result. I like this feature a lot and it would be sad to miss it. I use 10.9.1.

Besides, which forum software do you use? It’s awesome.

Cheers, Til