You really do need to give us a lot more information about your computer, version of VPX you have and what exactly you mean by the "video tab". Without all of that I suspect we are going to be completely guessing at how to help you. This pinned post will show you what information we need.
Yes the Audio Tab also the store tab doesn't have any content in it either most of the time I have to restart the program two or three times to get the content