Hello everyone,
Today I’ll talk about an issue that may occur with one of the new features in SharePoint 2013 task list with Timeline.
With this new task list, you have the possibility to add tasks on the timeline. But then, in order to do this, the user must have the permission to “manage” list, the contribution is not enough!
A simple contributor will see the option greyed out and won’t be able to use it.
Hope this helps.
Christopher.
Christopher Clement's Blog 