Hello!
I was using Observable on an intermittent network connection, and started piling up edits while offline. I had 36 edits cached locally (according to the bottom status bar), at which point the network reconnected. The changes did not synchronize immediately, but shortly thereafter the entire notebook changed to a “Sorry, an error occurred” sort of message as I continued to work in the notebook. Going back to the notebook, it appears that all 36 of those local changes were lost.
Please let me know if there’s any debug information I can provide, or if there’s a better forum for bug reports. The fact that the failure refreshed the page meant that there was probably nothing left in the console [edit: possibly it just seemed that way, actually…]. I’m happy to PM a moderator the notebook if it will assist with debugging (it’s currently private).