Must construct QApplication before QPaintDevice

[jacek]

MainWindowImpl mainwin;
mainwin.refreshDisplay();

As far as I can tell, this is whats causing the problem. Is there anyway I can get around this?

Do I understand correctly that you invoke refreshDisplay() before QApplication::exec()?

Maybe the error message is a bit misleading and you should try:

MainWindowImpl mainwin;
QTimer::singleShot( 0, & mainwin, "refreshDisplay" );

MainWindowImpl mainwin;
QTimer::singleShot( 0, & mainwin, "refreshDisplay" );

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(provided that refreshDisplay() is a slot)?