When I save an Edge Animate project, all my objects disappear from view on the Canvas

When I save an Animate project (File-->Save), all the objects on the stage disappear from view.  The outlines of the objects still appear when I click on them but the "content" of the object is invisible.  It's as if the opacity is set to zero upon save.

And, it doesn't matter whether I'm using the opacity atrribute or not . . .

Any ideas of what I'm doing wrong?  Is there some preference or configuration setting I need to toggle?

I'm running Edge Animate 1.5 on an iMac with Mac OS X 10.7.5