This is a registration issue...since the registered site is hidden link, it doesnt work on hidden link.
I know this because I was getting the white screen when I had changed my site from www and didnt change the registered site here in Toolset. Once I updated it in Toolset to match my exact URL, it worked fine.
can I get a temporary registration at least for my staging site? Others have addressed this issue in the forum without a resolution back in July 2018.