When viewing user story, users are unable to see existing tasks in the Tasks Collection tab. Alternatively, users may be unable to Add New tasks to the collection - given that they have Editor access. Users may be presented with "Whoops! We Hit A Snag." error.
The issue is caused by a corrupt or invalid saved user preference. To resolve the issue, each user who is experiencing the issue must clear the saved preference.
Task collection on a user story does not display tasks or user cannot add new tasks
Multiple users are unable to see tasks under User Stories
Task Tab on User Story causes Whoops - preference delete