Black buttons without text? New dark UI...

This dialogue appeared after or while InDesign CC trial was "extracting":

Is this the new Dark UI?

I closed the ExtendScript Toolkit CS6, and pressed the left button (that's where the OK button usually is), but then nothing happened.

I'm now downloading it all over again. (Waiting...)

I'm using Windows 7. Some visual effects turned off, to increase performance. But I have no problems with other software.

It also seems that scripts using ScriptUI have turned all black too, the treeview now showing any plus/minus or lines. I got a message about it, and that's why I'm now trying to install this thing, to see it for myself (I will take that matter in another part of the forum, since it's not related to the installation).