Revisiting this for an update- I tested password changes in an attempt to narrow down which special character/s were causing problems.
Unfortunately this caused me to be locked out from logging in through Launchbox again, even when going back to a character safe password.
The only way I've been able to get out of this is to switch username back and forth between email address and website ID (in the Launchbox EmuMovies area).
This is odd because all of the passwords worked for the EmuMovies website and ftp interface, and those changes appeared to be present in the Launchbox Settings.xml file.
For now I'll just say to be careful with how many special characters you use and if you keep getting failed login attempts, switch between your email address and web id. Your password may work for one and not another at seemingly random.
Maybe there's a temporary block put onto one ID but not another, and switching over gets rid of it.
Hopefully this helps someone in the distant future.