I am having the same exact problem, an older version of the quickstart was installed on one of my sites and the slider works just fine, I downloaded and installed the template on 2 different subdomains and see the same problem... please post the solution here when you figure it out!
I've found the problem. You just need to disable "Enable RTL support" option on every News Show Pro GK4 module > "External files" that you find that problem.