I have the same problem. If I deactivate Swift Performance it works perfectly, I can login via wp-admin but if I reenable the plugin I get the same problem again and can only access my page via backend pages as mentioned above.
– All my merge pages/ scripts are switched off.
– I have tried to disable the plugin and remove warmup table/ settings and reactivate still same problem.
– I have tried to uninstall and reinstall as well
