Creative Cloud won't work after starting – just shows an empty window.

Hello there!

I just have downloaded the Creative Cloud desktop software to install a trial version of InDesign CC. Sadly, all I get after starting the Creative Cloud, is an empty window with the black menu bar on top. That's all.

I have tried to re-install it, to update Adobe Air et cetera. Nothing works for me.

My system runs on Win7 64bit.

Thank you for any help,

Michael