Hi,

I haven’t seen this exact issue before with a notebook, but regarding the fact that you’ve been away for a while: is that notebook old, or was it created recently?
I’m wondering whether, if it’s an old notebook, it might be looking for some of the cluster IDs it had back then and has them stored, and now it can’t find them because the cluster was updated or new clusters were created.

I’d try creating a new notebook from both your workspace and from the shared workspace, just to rule things out and narrow down whether they still don’t work.

I’ll wait for more info!