I have Sky Safari 6 Pro v18.104.22.168 on Android and just found a problem with DSS images.
For any DSS image you have NOT downloaded already, have the phone in landscape mode. Then tap "Info->Show DSS Image" and the DSS image will download and display "as a landscape image".
Now go back to the sky view and then rotate the phone to portrait mode. Again tap "Info->Show DSS Image" for the same object and the image is STILL displayed landscape.
Hopefully this is an easy fix.