I am using a Dell D810. If I try to play a video file when the laptop is NOT docked, everything works as it should. However when the laptop is docked, that portion of the screen in totem where the video would be displayed is black. I can see the rest of the screen such as the "contols", but the picture is simply black. The audio does work as it is supposed to. I am using an old analog CRT monitor. This did not used to happen, but then I was using Cassandra and a flat screen LCD monitor with a DVI cable connection. I changed monitors and upgraded to Celena at about the same time.
Any idea what is going on and how it might be fixed.