I this I have the same problem. but having a hard time reproducing this in a test project. It happens when I apply skins to an existing workrelated project. Have narrow this down to that it is the TTntpanel that are making some trouble(Adding TTntPanel in the 3rd party list). This is only happen on a few modal windows an not all in the application, even if they have TTntpanels in them. So I'm totaly lost for now.