When I watch my video in the ram preview everything works fine. The solid object i animated with masks moves as intended. When I export the video the solid object layer is not there at all, its as if opacity got turned to 0 during the export but it's not. Attached in the link is a folder on dropbox with videos showing what I am talking about. One video is the ram preview and the other is what happens when I export. Dropbox - Messed up
It's not enough to say what is the reason of your issue. Please post a screen of all of your layers (timeline). Maby yo've marked your mask layer as a guide layer - and that is why it is not showing in final render?