Please help! I can not see any videos

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I didn't want to bother you about it, i tried to find the solution my self, but i couldn't. Since at about 2 weeks i can not see the videos inside the posts. I can only see some big empty windows with nothing inside them. Nothing happens even if i click on those. The funny thing is, that i can not even see the video links i had posted myself in the past. They had to do youtube videos. Anybody else has (or had) this probelm? Any solution? Thanks in advance