Power fft is not working

Hi,

Sometimes the "Power FFT Analysis Tool" window is getting hanged for few of the scope signals. I observed that if a number of signals are matrix multiplied using gain block then the signal is not refreshed properly in the FFT analysis window. I tried to replicate the same issue in the attached simulation file.

If I uncheck the 'Save Data to Workspace' option in Scope1 and then the FFT analysis of scope2 signal can be done.

If I check the 'Save Data to Workspace' option in Scope1 and run the model after clearing the workspace and closing the FFT window, sometimes it's getting hanged even at the time of opening FFT window.

I normally use matrix multiplication using gain block instead of mux and demux block to reduce the number of lines. I tried with the 2014 version and face the same problem.

Please help.

Thanks Shambhu Sau