I will not save any changes, and I just got this error message:
Sorry, we are having a temporary problem loading application data. Please try reloading the page in a bit…
Now it’s stuck on Loading your app.
For me, Bubble is a bit buggy as well! Very slow and not loading pages… It’s a bit annoying, since i want to work in it and make some progression 
Same issue now, lot of lags.
Will send a message to support.