That happened also to me once yesterday night.
It happened with the last capture but no with the previous ones.
I had copied it to my PC and I got an error on gimp and on the NASA FITS Liberator. Back to the rpi, KStars crashed when trying to open it.
The file was something like 844 KB (it was taken from the guide camera) while other previously shot, identical files that opened correctly were 855 KB.
I closed EKOS, KStars, and reopened again (not sure if I rebooted). Then, magically, the FITS was showing to be 855 KB and opened successfully.
I would say that saved pictures are not inmediately closed and in this zombi state they produce problems.

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