First of all, congratulations on the great work! Thank you for putting it out there!
I installed everything yesterday and today and everything was going fine and then I just couldn’t edit anything, it loads the dashboard and other editing pages but then it reloads into what I’m sending in attachment. I get a page with a few dots, an arrow and a 0 (when I copy+paste the result is “Stats”).
I have tested it on my test site and it’s working fine for me using latest version of Shapely 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.