If you use the Layer Object in your graphic, double check that the order of the layers is correct when you upgrade to 5.5. There was a new feature added in 5.5 that lets to rearrange the rendering order of the layers. Sometimes the render order in 5.11 would change on occasion, so in 5.5 you can force the order to what you expect.
There is a new tab in the Object Inspector to specify the order.
#XPression