We solved it by removing the Box.com LTI placements from the user & course menus. 🤣
I was chatting with another admin at another college, and they said they had the same problem. I tried to report the issue to Box, but they said "Canvas is an external app, so we can't help you", even though it's Box's LTI.
In any case, using Box in Canvas works well enough if you use it the way I think they intended it to work, which is by choosing it from the RCE or as an external tool. The placement links are the problematic part.
We haven't experienced OAuth issues with our installation. Good luck, and make sure to follow up if you've solved it!
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