I was hoping that the creator of this theme would see this message and issue a fix.
Since they did not, here is what I did:
I went to this site:
https://themes.trac.www.ads-software.com/ticket/4075
I downloaded the 1.0.13 version.
I unzipped it on my home computer.
I use my FTP program (Flezilla is free if you need ftp software)
to go into:
Domain/install directory (if you have one)/wp-content/themes/showcase/
and then I uploaded the 1.0.13 version ontop of all the files in that folder. I just let it replace every file, rather then trying to figure out which one has the problem.
Hope that helps tjuras.