I'm using Ubuntu 13.04 and I guess ever since I updated it from 12.10 I've been having a problem with qt applications (VLC and K3B, specifically). Sometimes, when I open them, the title bar doesn't work. It is unclickable, so when I try to double click it (to maximise it), or drag it, or click on one of the control buttons, the window simply minimizes. The solution I found was to Ctrl+Super+Up, so the window is maximized and the title bar disapears. If I restore the window again the title bar works normally again.
Here are some prints:
Best Answer
I have few suggestion you could try. 1. Check if the problem persists with other users created on your PC/Laptop 2. If the programs are working well on other user accounts, probably it has something to do with you misconfiguration of your profile.
What I would usually do is re-install unity:
sudo apt-get install --reinstall unity-servicessudo apt-get install ubuntu-desktop