Cant open Apps / Qlik display an empty page

[#1]

I just installed Qlik Sense Desktop, with no errors. BUT, when I click an app it opens a new Tab Windows, but this window is empty/blank.

I can even create an app, but when I open it, Qlik shows an empty window so I cant choose a Data Source. Same behavior if I access in  the browser.

I heard good thing about Qlik and was planning to show the app to the management, but this problem worries me.

Is this app stalbe enogugh???

I`ve tried this:

Can't connect to Qlik Sense Desktop

Regards.

[#2]

More info: I'm using Win8.1 64bits