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Every time I try to launch a modpack, I get the error message of "Invalid username or password." I don't know what to do. I've tried changing my password on FTB, but I still get that message. Any help?
If you have issues logging in, you can also check http://help.mojang.com/ and look at the service status (particularly 'logins' and 'sessions'). If one of them is down, there's the reason for your problems; you'll have to wait until Mojang fixes it.
If the services are fine, it's probably an issue on your end.
And finally, if you have migrated your minecraft account into the newer Mojang accounts, you have to use the emailadress instead of your original MC username. All of this of course is meant as steps to login to your minecraft/tekkit/magiclauncher/ftb/multimc client and not into the account you registered on these forums.