I'm having a slight problem here, when creating a file dialog as simple as this:

@QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"));@

It opens after 2 seconds, but then with a folder having 20-30 files, just hovering over a file takes 6 seconds for anything to happen, or just selecting a file, to it somehow freezes or something, so to select a file can take up to 10 seconds or more.

Info:
Visual Studio 2012 - C++ - Build Qt5 from source

What could I be doing wrong?

Ohh, and I also have another problem, if I have the master window, and then another window, then if I try to move the other window when open, it moves some pixels, but then gets stuck, and then I need to alt tab out, and then the window has gone back to it's original position, from where I can do it all over again.