Lost a whole series of maps...

I just opened up the game I have been working on and lost a whole series of maps that I had set up for an upcoming session. What happened?

Please carefully work through to 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. Step 3: Clear your cache If none of the above succeeds, please have your player thoroughly work through Step 4. (Don't forget the complete Console Log!) Thank you!

Da Smiling GM: Did you by any chance have multiple game tabs open? Roll20 can become confused as to which game is the active one and doesn't save the intended data. Just a possibility.