You are the admin and you are logged into Salesforce and Playbooks. However, you don't see the Playbooks panel and your tasks while in Salesforce. Others users in your organization have reported the same. You are receiving also a message when trying to open Playbooks:

 

Information

This behavior can be observed if there was an update in your organization's browser policy and the Playbooks extension was deleted or needs more permissions based on that change.

To get the extension to work again, complete the steps listed in the Playbooks Extension is not in Chrome KB Article, and when you get the screen shown in the overview, make sure you click on Re-enable button.

After hitting the Re-enable button, make sure you log back into Salesforce and to give permission to Playbooks to use the Chrome browser again.