I tried several Accounts on my computer with the newest launcher for 1.6 and it doesn't let me log in.
Error: "Could not login: Invalid credentials"
I also tried it several times to make sure that I didn't type the wrong password.
And yes I'm using my e-mail to log in.
Mojang page: Success
Minecraft page: Success
Old Launcher for MC 1.5.x: Success
New Launcher: Failed
There is also this thread I found on minecraftforum.net
http://www.minecraftforum.net/topic/1856302-invalid-login-with-any-account/
Linked issues
Comments 5
Moved from wrong project. Duplicate of MCL-568, please use the search function to see if your bug has already been submitted.
Same behaviour on Mac OS X.