Using fullscreen on my first monitor makes the other one gray

So when I go into fullscreen on my first monitor, the other one becomes gray (like the Mac OS X login screen, almost like this: http://fc02.deviantart.net/fs71/i/2011/183/2/e/linen_desktop_shaded_by_tbg10101- d3ksrb5.png).
It happens when i click the http://gyazo.com/e9d8ec2ecff4828a8465368de564ebcb small 2 arrows button on the top right of the window, and it also happens when I open some fullscreen programs. The only things this doesn't happen on and I still can click on stuff and do stuff on the other screen is League of Legends, fullscreen on  Video players in Google Chrome and Safari (like youtube.com, twitch.tv etc)... ( By the way when i go into fullscreen on youtube or twitch in Safari and i click on my second motor the Dock and a white list on the top comes up on the full screened monitor (the one with Safari), this is very annoying and should eb fixed.)
How can i fix this problem with the gray screen on second monitor tho? This problem kinda ruins the purpose why you should have a second monitor...
Thanks for the help

Hello Kladdy
Check the settings In System Preferences to make sure that Displays have separate Spaces and that should make it to where when you go full screen, it will not be a blank window. 
OS X: Using multiple displays in Mavericks
http://support.apple.com/kb/HT5891
Regards,
-Norm G.

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