If an LTSA display and a spectrogram display are both shown in a user display panel, then only one will work. I think this is due to them loading data one after the other, when the LTSA data are loaded, it clears the FFT data leaving nothing there to display in the spectrogram window. this only applies to the core release and seems OK in the Beta version which uses a new data loading system.
Seems to work for me.