SiteGround Optimizer Plugin, SiteGround Security Plugin and the JNews Import Demo & Style process

Either the SiteGround Optimizer or the SiteGround Security plugin appears to interfere with the last import phase (global styles) of the JNews demo import process on WordPress Multisite.

I tried numerous times to import the Travel Demo, only for the process to hang up on the final step.  Finally, I tried it on  fresh multisite testing install, with both the Optimizer and Security plugins disabled, and the demo import processs completed without a hitch.  At this point, I don’t know which one of the plugins caused the problem.