A Password Reset will force log your account out of the game in case a hijacker is using it.
It will also make you set a new password so choose a brand new, never used before one.
That support page has two buttons:
'Change Password'
and
'Reset Password'
you MUST use the
'Reset Password'
button.
Already changed my password and still no joy. Only thing i can think of is whatever world i was logged into on Friday has been taken offline for some reason. But this is causing the login issue.
Did you change your password or reset it?
Those two words mean something very different.
A password
'change'
will not force log the account out. A password
'reset'
will.
There are no worlds currently offline in RS3. I haven't checked OSRS but it can be checked too.