When using the export as option in photoshop cc 2018 i can a window to pop up that is completely uninteractable. I have tried uninstalling and reinstalling photoshop...clearing my preferances and even deleting the photoshop cc 2018. Prefs file and still this useful feature does not work. As a web developer i use this feature constantly in order to cut and export png files. I have been using illustrator to do this for 3 years now as photoshop still has not fixed this issue.