Yes, Matt. From what I understand as things have unwound here in my system there was some kind of "glitch" in assigning Mastery Connect assessments using the external tool (maybe this is the right word?). Anyway, I had used this successfully for three years and all of a sudden, the kids couldn't click on a button to start their tests...they weren't linked. This corresponded with the appearance of the Mastery Tracker in my navigation menu. I had believed I needed to use this navigation tool to make my tests work with the external tool. I do not think this is correct any more. I am going to try once more to roll out an assessment with the external tool and see what happens.
The mastery tracker navigation tool will link the canvas course with a mastery tracker. I cross link my classes, so if I want to use the mastery tracker navigation tool, I need to have all of my students in the cross linked class in the same tracker. I don't currently do that. I don't think the navigation tool is for me, the way I use Canvas. I should still be able to assign tests to sections in my course using the external tool though. That was a coincidental problem here in my county (or maybe not, who knows).
This sounds random and rambling. I hope it makes sense.