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"TypeError: ButtonBar.init is undefined" @ "buttonbar.js:682:5"
After a bit of testing I found that the reason being Button Bar and the Advanced Editor were conflicting. Having both on created this error, while having only one on fixed the issue.
Due to the way the images looked, and the descriptions, I didn't realize that the Advanced Editor had a "Button Bar" of it's own, and I thought both needed to be activated to maintain formatting in comments.
Thanks for your help!