General Keypad inactive during call

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http://androidforums.com – I have seen this problem mentioned on other forums, but couldn't find a reference to it here. Please post a link if I missed it. I just got my S3 today (Yay) and am in the process of setting things up. I have discovered that when I'm on a call that requires a number inputted like a password, etc. The keypad does not function. It was going to black screen, but I fixed that by turning off the proximity sensor. I can program in my voicemail password, so that isn't an issue, but if I want to press "7" to mark a message read, it doesn't work. Is there a setting I'm missing? (General)