In the Embedded Dialogs demo, you can get into a state where the comboboxes are positioned and clipped wrong.

To reproduce:
1. Start the Embedded Dialogs demo
2. Select "Right to left" layout direction
3. Select "cleanlooks" style
4. Click on the "Layout direction" combo box.

You should see that the combo box pops up a too small, empty menu too far to the left. This does not seem to happen when selecting the style first, and then the layout direction. Fooling around with the demo can give other similar results.