Hello Martin,
I have taken a look at your design within the 32-bit application and you are correct that the videos are not being generated. I have confirmed the design is setup correctly (though you will need a longer simulation in general for proper resonator results). I have also verified that the videos are properly generated in the latest version of the product.
The OptiFDTD 32-bit application was made available for free as a promotion many years ago and development on the product ceased at that time. For this reason I suspect it has something to do with the video codecs with the 32-bit on your system. If you want an up to date experience with OptiFDTD I would recommend acquiring the 30-day evaluation of the product available from the Downloads section.
Scott