I'm a developer for a tool provider and I have a client that uses Canvas and needs to create assignments that use our external tool launched into a new tab. 

The LTI 1.1 setup process is not an issue, and adding the assignment is straightforward, however, it seems that some roles such as the instructor that added the external tool assignment, when clicking the assignment, can only see the title and description but they do not see the "This tool needs to be loaded in a new browser window" text and a button below to launch the app as expected.. If a student views the assignment, they can see the button. 

Is this a bug or is there a setting they need to change? We tried adding the LTI app at both the global and course level, this does not resolve the issue.

I have a lot of instructors thinking the integration isn't working because of this.