Hi @john_curricume,
Thanks for the report. I will look into it. In general, to report XBlock bugs, you can open an issue on the XBlock’s repo like GitHub - open-craft/problem-builder: An XBlock for posing questions to students . Though it does sound like this may be a platform change that’s affecting problem-builder, as problem-builder is one of the only XBlocks that uses a hierarchy of blocks (XBlocks inside other XBlocks). So posting on Slack or the forum is fine if you’re not sure where the problem lies exactly.