While making adjustments to a page's dimensions (trial and error, so lots of clicking such that it became a routine), I clicked on the delete button of the page next to it. By instinct, I clicked the button that appeared on the right, normally the cancel button.
The meticulous encounter I had set up with lots of GM notes on each monster in the area is gone. Perhaps a backup system of some sort coupled with the current autosave would prevent things like this from happening in the future? Or a recycle bin, or even just sending deleted things to a temporary area so that they can be undone if deleted by accident and have the temporary space cleared out within a day.
Otherwise, I'm very pleased with Roll20. This was totally my fault (except I'm not sure why "Delete" is on the right rather than the left).
