Hey Zach, I have been through both with a fine tooth comb and I know it is not due to a miss-spelling and I can confirm that this field is not found within the actual "repeat" (related table) for the survey. So, I think what I might try is something that James referenced above about being able to reference questions from the parent survey into the repeat.
James stated: "This was a bug discovered late in release testing, related to an enhancement introduced to specify a field by using <tablename>.<fieldname> (this was introduced to enable referencing a field in the parent table inside a repeat section). We will be addressing this issue in the near future."
I am going to give this a try first to see if this works, but thank you for the tips.