Users are unable to login with passwords containing an ampersand "&" character.
The problem is in operations.js which creates a string with user-supplied data without any escaping:
var username = document.forms['loginform'].username.value;
var password = document.forms['loginform'].password.value;
var server = document.forms['loginform'].server.value;
[...]
var paramData = "username=" + username + "&password=" + password + "&server=" + server;
The string paramData is then sent to the server with var request = YAHOO.util.Connect.asyncRequest('POST', url, callback, paramData);
An "&" charater is embedded into the paramData string without being properly encoded.
A simple fix is to change the line:
var password = document.forms['loginform'].password.value;
to:
var password = escape(document.forms['loginform'].password.value);
This results in a properly encoded password to embed into paramData string.