I still wonder what you are doing... There is only one game server, so there is probably no need to click that list entry at all, it is selected anyway. Enter email and password, try to log in: If I understood well, this part is working? So after you logged in, selected a character and entered the world, quit the game: This should update your configuration file in a way that email and password-hash (if remembering is enabled) are stored and should appear again when logging in next time.
Open the directory %APPDATA%\PlaneShift and check the last modification date of your planeshift.cfg: Was it currently updated while quitting PlaneShift?