I'm using a MenuStrip that I pass a custom ProfessionalColorTable by way of a ToolStripProfessionalRenderer. Beneath the MenuStrip is a Panel that has a background image. About 5 seconds after startup I get a screen flicker like the form is refreshing, though I don't have any code that is executing at that time. If one of the MenuItems is in DropDown mode when the refresh occurs, then the entire contents of the MenuItem is filled with the background image of the panel . Has anyone else run into this?