I've been made aware of a change that will be coming to the website soon, although Invision can't confirm when.
Your login to the forum is currently your "forum display name" or "email address"
With the next release (v5) of the forum software though this will be changed to your "email address" only
It is a good move as it will increase security but i suspect its going to lead to many people confused - still trying to use their display name to log in and wondering why it wont work.
Passwords won't change its just the log in name part but I'd advise everyone to start using your email address instead to get used to it before we get forced to use it.
You can update your email address in your profile settings if it's an old email address
Any questions or queries, just give me a shout and I will try to help.