新应用程序在Ubuntu的错误x屏幕中打开

I have a dual monitor setup and each has its own x screen in Ubuntu 9.04. Everything works as it should in screen 0. When I open an application in screen 1 (using any menu, e.g., Applications, Places, etc.), it opens in screen 0 instead of screen 1.I have a dual monitor setup and each has its ow