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The problem of Flash Videos not playing on Mac is related to macOS not being readily compatible with Adobe Flash Player and it can be fixed by tweaking certain browser settings to make Flash Videos run on Mac. In general, you should be able to fix the problem of Flash Videos not playing on Mac using the following methods.

If there is problem playing YouTube Videos, make sure that you have the latest version of Safari and Chrome Browsers installed on your Mac. This is due to the default setting in Safari, which only allows Flash to be enabled on a site-by-site basis. At the bottom right corner, you will see the option to enable Flash when visiting other websites.


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For security reasons, it is recommended that you stick to the default option of enabling Flash on a Site-by-site basis. To do this, open Safari and then click on Safari at the top and click on Preferences. Click on the Websites tab and there should be a section called Plug-ins at the bottom of the left panel.

Make sure that Adobe Flash Player is checked. Some people have reported that videos will work properly upon clearing cache.

Flash Videos Not Playing on Mac

Make sure to check Cached images and files and then click the Clear Data button. A lot of Flash content requires Javascript, so if you have an extension that is blocking Javascript from running, you will need to disable it. You can also try disabling the popup blocker for the particular site you are having issues on.

While on the screen of the blank YouTube video that is not working correctly, right-click the area where the video would normally show up to bring up the Flash Player context menu.


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Select the Settings option from the menu. Unselect the option Enable hardware acceleration and click the Close button. If you are not seeing the right-click content menu, simply visit this Adobe help page and right-click on the Flash logo. Close out of the browser completely, relaunch and test the Flash content again to see if it plays.

Discover the best ways to fix YouTube videos black screen on Mac

YouTube now supports HTML 5 fully and as long as you are running a fairly recent version of your browser, all the features should be fully supported too. If something is not checked here, that means your browser is very old and needs to be updated. Hopefully, this post will help you to troubleshoot blank video players and non-working Flash apps in OS X.