Ok Guys, I seem to have figured out what went wrong. So the images where taken and succesfully transfered. But somehow my local (on my mac) kstars instance messed up with the i/o drivers (local file operations). I always watched the images with GIMP, but when I accidentally tried to open them in kstars it showed up an error message stating "too many io drivers". So I did restart kstars but it still doesn't work, so I (and I normally never do it) restarted my mac and now everything seems to work. What is more interesting is, that I had this issue already last year and it went away without a reboot. But anyway, I think this is more something for the kstar developers and if a simple reboot will fix this issue I am good with it.

So thanks again for your support @AstroMuni and @Jasem Mutlaq

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