So here's the deal. I installed the new 2016 version of Trueview. My customer was using 2015. Once Trueview detects there's a missing xref, it'll ask if you want to resolve the path, like autocad. If you say ignore, it'll remember your selection and not prompt you going forward. When I was on my customer's computer, the prompt didn't pop up which is why we are now here. Not sure how to get the prompt back.
Anyways, when I installed the new version on my computer, the prompt came up, I chose to resolve the path and the xref manager came up! I docked it and so far it stayed put after opening multiple files.
I don't understand why this is so hard to find. There use to be a button that looked like a binder clip on the lower right of the application window in the status bar that you can toggle. Now its gone. It shouldn't be this hard to find the feature. Its critical info for the drawing.
Hope the fix it in an update. I doubt it.