OK, looks like I found the problem. I tried with another computer and got it to work under windows. The I thought it was a "Windows" vs. "Linux" kind of problem.. but.. it seems like the QT version I originally used on the linux box is too old (4.7.0). It works under windows in 4.7.3 and on another Linux machine with 4.7.3 as well. So, I will upgrade my machine to 4.7.3 immediately.
Thanks for trying this out.