You may find that a character you've inserted into Storyline has a white line or box behind it when you preview or publish.
This can occur when applying a perspective shadow to the character.
This issue was corrected in Update 2 for Storyline. To take advantage of the new features and fixes, download and install the latest version of Storyline from the link in your product confirmation email, or get it here. Then republish your Storyline project.