There are a couple possibilities: There has been a recurring bug in Chrome that has caused this. It has been going on for years now, and is just completely unbelievable that it isn't fixed yet. Here is the most recent post I know of:
(It is ok if the sound doesn't work, just do what he does in the video.)
Beyond that, you can do what I do, and that is use FireFox until they fix this... again... and again, and again. This is enough to make me give up on Chrome. Not that there is a bug, but that there is a bug that keeps coming back for a period of years now.
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