In QT 4.7.3, Components are not displayed

 

Hi, I’m working on a GUI that has been shown to display and function according to spec on other Linux machines using an equivalent version of QT (4.7.3). In my Linux environment unfortunately, the buttons, text fields, and drop down menus are not displayed. I’ve tried with simple button applications and upgraded my QT package but experienced the same problem; what could be preventing the components from being drawn?

Thanks in advance for any help,
PC