Haven't been able to open Plex for weeks

I haven’t been able to use Plex for weeks with the message in the screenshot attached.

I have cleared cache, uninstalled and reinstalled Plex (on OSX).

When I try and download the software again I get this:

I can not log in to this one particular machine, the one that runs Plex Server. I can obviously log on via different machines as I am posting thsi under the same account:

Can it be with your browser?
I mean I know not Apple/MAC but I was able to download the mac installer.
Maybe an extension in your browser is blocking something. Can you test try another browser?

I can’t even log in. I have tried Chrome and Firefox on the same machine.

Goto this URL. What do you get?
http://status.plex.tv/

I already tried that link and it shows everything is up.

I just looked at the console debugger in Firefox and can see this error:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://plex.tv/api/v2/users/signin?X-Plex-Product=www.plex.tv&X-Plex-Client-Identifier=93a0458b-efa5-f90e-0180-53eba93cc529&X-Plex-Platform=Firefox&X-Plex-Platform-Version=63.0&X-Plex-Device=OS%20X.

I have zero plugins or extensions in Firefox

Same on the download page:

I don’t know what the issue may be then. I’m sure some gurus that excel in web/css/html can debug your screenshots. Sorry.

Chrome reports a certificate authority issue, I thought maybe I had an out of date Chrome version with invalid root certs but it is up to date.

This may not help but I am seeing alot of recent posts(more then 4) about connecting to plex.tv. Seems like quite a few people are experiencing similar issues. None just like yours but nonetheless they are popping up quickly in the new post tab.