Sage CRM: Cannot save task after upgrade

Description

After upgrade CRM to 7.2, when saving a task, nothing happens.

Cause

This issue is caused by the comm_isalldayevent field set to Required.

Resolution

Steps to resolve issue:

1. Login to CRM as admin
2. Go to Administration, customization, communication, in Fields tab
3. Click on Filed Security for All day Event
4. Uncheck Required, click on Continue