Lost Map Elements!!

Hello, So I just finished developing a new map with monsters, trees, players, etc. But when I re-opened the map all of the trees, monsters, and players were deleted. Does this always happen? How can I prevent this?

Did your game show the red 'connection lost' box at the top of your page? This can prevent your session from saving in real time. Other options could be if you'd uploaded the art yourself, placed it, and then deleted it from the 'recent uploads' section of your library. For the sake of completeness here are the official trouble shooting steps: Carefully work through the first three steps of our guide to Solving Technical Issues ? Step 1: Make sure to use the right browser Please check if these issues persist when using both Chrome and Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20 Please disable all add-ons/extensions and anti-virus programs. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through Step 4 . (Don't forget the complete Console Log!) Thank you!