Zoho CRM / Task View, defaults and custom views does not load anymore

Zoho CRM / Task View, defaults and custom views does not load anymore

Zoho "deactivitated" Activities and split into Tasks, Calls and Meetings. Since then  I have switched 2 views but now module "Tasks" does not load anymore.  It has worked until last Thursday.  I cannot see even default views, this applies also to other members of our firm. We are working with this daily to structure our tasks. Urgent!!