video not showing on timeline

Hi! 

I've been using premiere for some time now, but I´m far from being an expert, and i´m having some trouble. 

I´m trying to drag a clip for the timeline and i can only drag the audio, why is this happening? does this happen to anybody else? 

I think i´ts not because of the format, because I always use the same format and it always works, but not today.

Thank you for you time!