Copied Mural Shows the Mural and Then Goes Blank

I've copied a mural from another Mural and my new copy will flash the Mural and then it will go blank. I've done this from doing a copy from inside the Mural I am trying to copy as well as creating a template and creating it from there. Also, the thumbnail of the copies says "Generating thumbnail...". has anyone seen this before? Thanks.

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