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Flat frames get imported in a corrupt manner
so while testing APP the flat frames of one of my sessions get imported in a corrupt manner (Example). The file format is (Nikon) NEF and other software (DSS, Photoshop) do read them in a normal and predicted fashion.
This only happens with the flat frames, all pictures that were taken before and after are recognized fine.
What might this be and how can i fix it? I also tried converting the NEF files into TIF (16bit) with the help of Photoshop and then they are imported correctly but cannot be matched together with the other frames anymore and i get the "Critical warning: Flat-field calibration can not be performed correctly!".