Couple things, back button usually will error-out because of CSRF security protection. To fix the modules missing, you will need to locate the zpanel_coire.sql file and re-import the x_permissions and x_modules tables into your ZPanel database, Or, restore a previous backup of your database.
Core database: https://github.com/sentora/sentora-core/...l_core.sql
As always, make a backup before making any changes!
Core database: https://github.com/sentora/sentora-core/...l_core.sql
As always, make a backup before making any changes!