I like this program and think it does a good job of HDR, but I am getting some annoying artifacts that I cannot figure out. Please look at this crop from an HDR image and note the dark streak and dark spots in the sky (the latter may not be easily visible) that the arrows point to. None of these are present in any of the 3 source images. I am using the default settings, is there something else I should be doing? Thanks for any advice.