When you are logged into any client, going right to another client, even if its not the current Fabiano (closest to prod source) source, it will show you logged in as your last client logged in account and it most likely will show some kind of message in the server.exe log including the credentials it attempted to log in with, yes it has to do with the .sol files, just simply log out of prod client before opening a pserver client, also don't register with your username/password even if you didn't accidentally get the glitched prod login on a pserver client, because it is extremely easy to remove the SHA1 encryption from the passwords, to where your password shows as regular characters in the database, just use a fake email, no pserver owners even use the forgot password feature or anything involving emails.