The Aero Flip 2D does not work anymore although the Flip 3D does . When I press Alt+Tab I only see the classic list of active tasks: And I cannot use the directional keys to select a task. Facts about the problem: Ø Only one user account is affected. Ø The Desktop Composition is active . Ø Ctrl + Alt + Tab does not work. Ø Ctrl + Win + Tab works and shows the Flip 3D . Ø All other Aero effects work well: Flip 3D, Snap, Shake, Peek, ... Verifications that have already been made: ü $> chkdsk /f c: ü Aero troubleshooting. ü $> sfc /verifyonly ü $> gpedit.msc . Nothing prevents Aero from working properly. ü All the relevant services are active: DWM, Themes. I will only create another user account as a last resort, so I hope someone can help me.