Hi David,
I’m sorry you’ve hit up against difficulties.
I have tried disabling all plugins as well as changing themes but the behavior continues.
Can you confirm which theme you switched to (was it a default, unmodified theme such as Twenty Fifteen)? The reason I ask is that I see a Javascript type error relating to some code that ships as part of your theme (“Evolux”).
This may not be the ultimate issue but it certainly seems like a likely culprit and, if nothing else, should be cleaned up to allow further troubleshooting.