[CLIENT] Unexpected Platform Error, Login Error

I've seen several other posts about it, but I'm just tagging it correctly. Maybe it will expedite a fix...

Same issues as others are having... I try to log in. I get "Did not receive a response from server; retrying" message. It attempts several times. Then I get "Log in error" with tips screen and links on how to possibly solve the problem.

If I do manage to connect to the server I get the "Unexpected Platform Error" message. Then I get a revolving "Logging On" screen which goes no where.

Restarting client, un checking "Remember Username", running client as administrator. None of these do anything for me personally. Has to be a 5.18 issue.