Checked in both the SL base viewer and Firestorm - Previously working ability to see video / movie / TV / media sources streaming via HTTPS:// now just fail with a blank screen inworld.
LetsEncrypt certificate mess seems to be the issue, as we confirmed the streaming sources use LetsEncypt certificates.
The viewers need to be updated to use the latest certificates or vlc plugin most likely.
Is there a better place to report this bug?