I've just been testing a new document on our server and have the document password (Section Access) for one user containing a £ sign (ANSI 163). This password won't work via AJAX (screen is just blank) but DOES work using plug-in. All my other user passwords work fine.
Of course there's no problem changing the character, but has anyone else noticed this? I can't find anywhere a list of unsupported characters for use in passwords.