c++ - Qt: MainWindow->show() crashes program on call -

i've been working on program using qt in c++ , far good. needed program moved machine. have subversion, committed every file in project folder , checked out on new machine. after jumping through hoops build , running, error:

 assert: "dst.depth() == 32" in file qgl.cpp,.  invalid parameter passed c runtime function qt 

i tried stepping through program find point crashes , found after had been initialized , show() called class inherits qmainwindow class. c->showview() line calls qmianwindow->show().

 ----------main.cpp------------  #include <qapplication>   #include "modeli.h"  #include "controlleri.h"  #include "model.h"  #include "controller.h"    int main(int argc, char *argv[])  {       qapplication a(argc, argv);       modeli *m = new model();       controlleri *c = new controller(m);       c->showview();                         <- error here       return a.exec();  } 

the confusing part of problem program works fine on machine when show() called. don't know different between 2 machines make program behave differently. both use same version of qt (sdk 2010.05). both developing eclipse. difference can find compiler mingw 4.5.0 , other machine's mingw 4.5.2.

edit 1:

this controller::showview() looks like.

 void controller::showview()  {      mview->show();  } 

and how mview initialized.

 mview = new view(mmodel, this);