MacBook Pro Safari V 14.1.2 (14611.3.10.1.7) Live Video Displays Black Screen with Audio

Hello,

I am a Mac user since the ][-C days. I have a MacBook Pro13,3 running 10.14.6 (I have some 32-bit apps I need for work) but when I tried to pull up the March Madness® feed to surf a few games last Friday, I could hear them, but the screen was black. The feeds worked fine in Chrome, so I chalked it up to yet another Intarweb Safari incompatibility and watched it on Chrome. Today I was on the Showtime+ streaming site and discovered the live East/West streams had the same issue, while on-demand content works fine.

I have no issues with YouTube videos (I do not use the live TV feature) or other on-demand streaming services. I can watch live feeds powered by Akamai (Fox, MSNBC, CNN, local TV). I could not determine what powered NCAA and Showtime live video, but I do not think it is Akamai.

I have cleared the cache, tried switching between tabs or applications and back to the live video and running all of the user agents available in the developer menu. I am not advanced enough to troubleshoot corrupt system files. There is little to be found in forums about the issue and I did not see any threads that noted live feeds as the specific issue. From what I have read, it seems the latest Safari patch might be the culprit. However, I cannot say, as I have not tried to view live video in quite some time.

I hope this is helpful and not too long. Thanks in advance for any advice you can give.