Hello Alex,
One thing to note is that with the Fourier transforms on a the Gaussian pulse, the further you go away from the central wavelength the less accurate your results are. Your source is 0.55 um and you are running Fourier transforms from 0.3 to 1.1 um. With the 64-bit product I only find the value going over one if I move away from the central wavelength.
Based on the information you have made available it would appear that you are dealing with one of two situations:
1. You are running into a bug that is specific to the 32-bit free product which is out-dated and not currently maintained.
2. You are looking at values that are to far from your central wavelength based on your pulse width.
Scott