I am having trouble signing in to the App Store
I am having trouble signing into the App Store to purchase an app for the Mac (Facetime for Mac). I have an Apple ID that works perfect with iTunes, additionally I used the same Apple ID to login to this support forum, again, no problems. However when I attempt to use it for the App Store, I get a message that reads, your password is invalid, it must have upper case, and lower case, and numbers etc. I am a single user, one person with one Apple ID on one iMac. Thank you for your time and help.
iPhone 4, iOS 5