I had a similar problem yesterday. I'm sure I saved my file before going to bed the night before. I got home last night, did some changes (without loading the saved code), ran the code and the previous night's changes had been lost. So where is the browser's code cached? Should I always reload the previous saved file before I start working on it again?
I've been using Adventuron for over two years now and I've never lost changes that I have saved with ONE exception:
If you save in incognito mode then the changes will not be saved. Make sure that Adventuron is always loaded in non-incognito mode. It requires access to the web data store, but in incognito, this is removed when the incognito tab is closed.
Saving a backup is always recommended, hence the save-file option.