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I do get several pop up windows when I first open the file: "Unknown Data has been encountered reading layer "Book Cover copy 3" and will be discarded. Continue?" Then I have three buttons: Okay, Cancel, and Read Composite Data. When I click Read Composite Data it tells me "Could not complete your request due to a program error." If I click Okay, it moves on to a new pop up that reads:  "Unknown Data has been encountered reading layer "Book Cover copy 4" and will be discarded. Continue?"  I click okay, and get:  "Unknown Data has been encountered reading layer "Book Cover copy 5" and will be discarded. Continue?" Then I get the message:  "Unknown Data has been encountered reading layer "Book Cover" and will be discarded. Continue?" Then it moves on to  "Unknown Data has been encountered reading layer "Book Cover copy" and will be discarded. Continue?"

After all these, the message reads: " "Unknown Data has been encountered reading layer "Edit This" and will be discarded. Continue?" Clicking okay will then allow the mockup to open.

However, I get the same notifications when I open the one file out of the seven that does work.