When trying to open a video I always get this message 'Adobe Flash Player not allowed". If I right click I get a message saying "allow this plug in". I click that and the video works. Sometimes the right click does nothing, so I cannot view the video.
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I'm concerned about the "allow this plugin" menu item that you describe seeing sometimes. This doesn't sound like a default Chrome menu. Could you try temporarily disabling all of these to see if one of these is blocking Flash and is the owner of this menu item?
Ok, thank you for trying. Let's try this instead.