Sorry for your lost work 
…
Unfortunately the server logs aren’t useful in this case, the browser console output would have been more relevant but it’s quite volatile, a page refresh and it’s gone…
I never heard of stories of entire sets of dashboards vanishing when renaming one. I’m not saying it’s impossible and that cannot be a bug - something obviously happened there - but it would be a nasty one; probably someone would have run into it already if it happened a lot or was easily reproductible.
So I’m guessing it was related to your particular data, or the new name being invalid… hard to tell. I can have a closer look but I’m not guaranteed to find anything.
I’m assuming you don’t have your dashboard open on your iPhone anymore, but if you had and it happens again you can salvage the configuration by using the “Edit the local panel configuration” link and downloading the configuration from there. Then you can import it again.
Another thing worth looking at is in Paper UI > Configuration > Services > UI > HABPanel > Configure > Show more, you’ll have the entire contents of the “panel registry”, maybe there’s something there but it’s corrupted. Be careful with it though, you don’t want to do any more damage. Don’t save if you’re unsure.
The way service configuration is stored cannot be controlled, the only way would be to change the storage backend and API completely, I’ve been thinking about it but it’s not an easy task, especially finding a safe and reliable way of migrating existing data for all users.