I’m glad to hear that this copy is working for you! I’ve passed the information onto our engineers who can investigate further into what caused this issue on the original board. I will convert this post into a support ticket so that I can provide additional updates as I receive them. However, I would recommend using this copy and sending it out to your participants, so you can continue your work in the meantime.
One thing worth noting, to optimize performance during your workshop, if you have more than 100 collaborators actively participating on the board, or more than 200 users just viewing the board, it’s worth splitting your collaborators into multiple boards, by making additional copies or using Breakout Boards.