Sequencer isn't showing TV media.

Hello. Unreal is promising but frustrating as hell. I was working on a test project to check unreal possibilities in Archviz domain. So far so good. But in the end while exporting a sequence. As soon as the camera pans up to show the TV it shows my background (hdribackdrop) in output which doesn’t make sense at all.

Here is the link to exported AVI.

Please HELP.