Period one is 7/01/07 - 7/31/07
Period twelve is 06/01/08 - 06/30/08
Everything is set up correctly, but the interval does not work properly. Basically the issue I am seeing is the interval command is not calculating the correct start and end dates when using fiscal year. Let me see if i can take a screen shot to show you what is happening.

I have a screen shot, but can't upload it if anyone wants to see it i can send it via email