Spent a while on chat, and she said she'd email me with further information! Just got this:
Hello again Brooke,
Thank you for reaching out to Squarespace, my name is Jade and I'll be happy to assist you. We previously chatting earlier today and I wanted to send a follow-up on the issue regarding your page sections displaying an error message on your site.
Thank you for reporting this behavior. I can confirm this is related to an issue with our page editing system on our end. Our Engineering team is aware of this issue, and they’re currently working toward a fix.
We’re unable to offer a timeline for resolution, but I can assure you that we’re working to have this resolved as soon as possible.
We'll follow up in this ticket as soon as we have any updates.
Please let me know if there is anything else we can answer for you - we're here 24/7 and always happy to help!
Jade D.