Not a Bug Suggestion: Invalid Username or Password Prompt Box

This is just a suggestion. I noticed that when I tried to enter an incorrect username or password within the in-game login screen, the login menu it simply flashed once. There should be an "Invalid Username or Password" pop-up or some sort of dialogue box that appears to alert the user.

I'm sure this is something already thought about by the Development team, but I wanted to post it just in case. :)