Hi Di,
Thank you for reaching out to us, and reporting your findings. However, there are several reasons for these to be occured within POP tool before we conclude that this is a bug. One example is that the POP settings are different for different cases, also make sure that you click save button before the calcution to make sure any changes on the parameters are updated before the calculation (I believe that might be the case for when you are comparing the results on different PCs or different ZOS versions). Regarding the resampling please consider the case that you might be having the peak Irradiance selected within the settings:
By changing the sampling in this case it is expected to have different total power results.
Nevertheless, if you are still facing difficulties and considering the results are different. In order for me to check if this is an actual bug I will need POP's tool parameters as well as the optical system setup. The quickest way would be to open a case with us so you can share the files with me. If you do not have support though then will need to do the procedure through this post. Let me know if thats the case and will provide you with guidance.
Kind Regards,
Niki
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