GCal only works "one way" after update 1.7

Hey there, i updated Appointment+ today to Version 1.7 today. Everything works as usual except the Google Calendar integration. It works fine from Website-> Gcal, but not from Gcal- >Website. Deleting Appointments in GCal does not affect the Blocked Appointments on the Website (waited 30mins). I double checked all Settings, reinstalled the Plugin, Reseted the API Credentials twice, made sure that i'm not using the GCal Primary Calendar. Enabled Support via WPMU Dashboard in case you wanna check. Please help me out!
Thanks in advance, Michael