Brandonssss Said:
"Full Screen Flickering on Hulu, Netflix, etc.: Hello, The router is good, and I've even taken my laptop to work to see if I can fix it there but the issue is still there even on a different wifi connection. I didn't have this issue up until three weeks ago."
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Any Recent Updates?
If so, then this may be a bug. So, contact these sites/channels and see if they have yet to do their part in compatibility. In the mean time, try reinstalling the macOS. It may not have gone through successfully....
Reinstalling the macOS:
If that application cannot be opened 100%, then you may need to reinstall the macOS. The upgrade may not have been 100% successful.
1. First, Back up your Mac:
Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall.
2. Then, Reinstall the macOS:
Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support
Always Back Up:
Take this as a learning experience, knowing to always create a Time Machine backup of your Mac prior to installing and upgrade, so that you can have something to restore your Mac from, should anything go wrong with the transfer.