Ugly Grey Line With Picture From File

Same issue with grey outline around pngs I brought into my storyline piece. The images have rounded shapes in the background, so there was no way they could be cropped. My work around was to bring the images into powerpoint (no problem with grey outlines here), each on its own slide. Save the ppt and import it into storyline. Once imported they are available in storyview in a new section of slides. Copy the image and paste into the slide where you want it. Then remember to delete the storyview with the powerpoint slides on. The quality isn't quite as good but it's a way round the problem.

Hope this helps anyone who is still struggling with this problem.