Black screen

Hello Something strange has been happening recently, and now even with the new version 2.01. Every time I double click on a video VLC opens and start playing, which I can see from the scroll bar at the bottom which starts counting the time. However the screen is completely black. If I select any option from the menu bar at the top the picture returns except for the menu bar option opens. I can thus view any movie providing I have one of the menu bar options at the top selected. I have learnt to select help as this had the smallest sub menu and there blocks the screen the least. The minute the menu closes the picture goes black again. Thx for your help and keep up the good work.