Sorry to hear of the problem you are having.
I have tested it on my test site and it’s working fine for me using latest version of theme.
This can be due to plugin conflict on your site so please try temporary deactivating all plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.
Are you facing this issue with any particular Customizer field or all?
Could you please also try changing and saving the settings multiple time?
At the moment we have an issues with this, but we made a little fix for this – after saving once you can go to the homepage or any other page and then hit reload again and it should apply latest settings. This is a temporary solution and we will try to fix this completely.
Sorry for that.
There was another issue before (when saving didn’t work at all), which is now fixed and we were worried that it came back.
With temporary solution we mean that at the moment we don’t have a better fix for this issue, but we are working on it to fix it completely.