@ABraun, the solution is quite simple. Try to run mt_prep_gamma inside your “export” folder, like this:
mt_prep_gamma 20150806 /data2/…/Export_to_stamps/ 0.4 2 2 50 200
mt_prep_gamma [your master] [full path to your working directory] [Amplitude disp.] [Number of patches in range] [Number of patches in azimuth] [overlapping pixels between patches in range] [overlapping pixels between patches in azimuth]
It worked for me, at least I didn’t get the error message concerning opening the pscands.1.ij file.
Unfortunately, I now got the same issue as @katherine before, namely that the pscands.1.ij file is empty…