Problems side Loading apps

[volumetric]

Hi guys, I'm having difficulties side loading apps .apk (not from the play store) on my N7.
I download an app from dropbox,the install window appears but when i tap install nothing happens, by the way my N7 is rooted, could this be the reason my apps aren't installing??

please help

 

[dralezero]

is this on?

settings > security > unknown sources

(if you have to in order to root then I don't know, I haven't rooted yet)

Sent from my Nexus 7

 

[volumetric]

thanks,
I forgot to say that I already set it to unknown sources and
I still can't install