Do you mean the default theme using default colors and settings, because that is the out-of-box theme with only a couple of tweaks mostly color related.
Disabling plugins only made things worse, as I had to rebuild the user cash and then everyone had to refresh or clear their site data whereas...
I have a relatively new install of the software running 2.3.6. after my initial setup I rebuilt all the user caches and then requested that everyone clear their data and their browser cache.
Some users are experiencing intermittent issues with page loads in particularly with Safari.
Here are...