May I know where exactly you are watching videos? is it possible to attach a screenshot, so we can see what is the issue exactly.
They are youtube videos and I'm sorry I don't know how to screenshoot.
This is the Adobe BC forum for their web product, I think your looking for flash support... Best option is google that issue, the first few results I can see seem to have good solutions. Primary thing - make sure you have the latest version of flash.