Change the characters allowed in passwords
By default Sitelok allows the following characters to be used in passwords
0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@$%^&*()-_+=:;.,/<>{}[]|~`?
You can change them by adding this setting to slconfig.php (anywhere near your other settings is ok)
$ValidPasswordChars="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@$%^&*()-_+=:;.,/<>{}[]|~`?";
and changing the characters as needed.
We also have the Password Security plugin which allows you to change the allowed characters as well as set other password requirements.