It's working fine, i was nesting the MenuItem entrys and that didn't work Stefan

It's not Qt specific and that's how Windows worked from the time it was invented. The accelerators are keyboard navigation aid and they are not shown unless you use keyboard.

Maybe there's a widget that you didn't put into a layout? The default position of such widget is in the upper left corner and the 100px sound like some default size. Try adding this in your main: qApp->setStyleSheet("QWidget { border: 2px solid red;}"); This should put a red frame around every widget so you'll see if anything's there.

@silex92 Perhaps you should post some code to try the scenario.

ty, I have downgraded some packages (libglapi-mesa f.e.) and reinstalled some others. nopw everything is fine!

It looks like there might be an easier mechanism to do this kind of thing with in the future. Rather than writing my own MenuBar from scratch, the Qt team have implemented styling support for most of their components. Whilst i haven't tried this yet (I'm stuck on a different part of my project at the moment), MenuBar Style should be perfect for what I was originally trying to acheive, by writing custom delegates, with the appropriate behaviours attached to their properties.

@mcosta "Have rebuilt the same code with a different version of Qt?" - yes, I did it "Running both versions of the application on the same machine shows you different results??" - yes I guess something has changed in Qt sources since version 5.3 or 5.4. I hope this thing (to show menu shortcuts) is tweakable via Qt API.