my situation is as follows:
I'm using QtCreator to design my GUI and thus have a main window like this:
@WASABIWindow::WASABIWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::WASABIWindow)
{
ui->setupUi(this);
setCentralWidget(ui->tabWidgetMain);@

In the end of the constructor I instantiate a QTimer *timer; like this:
@timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(update()));
timer->start(2000); // 50Hz@

"update()" is defined as a "private slot" in the header and within that function I am calling another function "updateGUI" (among other things). Liek here:
@void WASABIWindow::update() {
updateGUI();
}@
This "updateGUI(bool force = false)" is a private member function of my WASABIWindow.
In this function, then, the following line gives me a SIGSEGV:
@ui->textEditPAD->acceptDrops();@

and it is totally irrelevant, what I try to call on textEditPAD. It always fails.
Even this
@ if (!ui){
return;
}@

Did not help.

What is the magic about this Ui-concept?
Please help, I am desperate..