I have exactly the same problem as described by zerg686 asked 8 months ago concerning the Admin panel All is well with versions up to 3.00, but using Version 3.4 and later: i cannot access the following (meaning Menu is displayed in the dashboard but when i click it only blank page shows at the right side of the screen):

• Locations
• Services
• Employees
• Connections
• Tools
• Vacations

The following remaining three i can access:

• Appointment
• Settings
• Report

The browser console does not report an error. Purging cahe does not help either.   I have tried it on different domains that use different themes and plugins all are on same hosting service / provider