We have checked this through FireFox and the videos play as intended. Please go here and double check that your Flash player is enabled: https://helpx.adobe.com/flash-player.html
Also if possible can you please provide some of the videos you have opened and do not play so we can investigate this further? Thank you!
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no videos will play for me in Firefox. I haven't tried another browser, but shouldn't have to. Yep, flash player is up to date. This has been an issue for almost a week.