All tokens deleted from all maps after adding new module

I have been running Waterdeep: Dungeon of the Mad Mage and decided to add a 1-shot module from the Roll20 Marketplace. After buying and adding the new module, all of the tokens were deleted from every other existing map. DotMM has over 25 maps with tons of tokens on each one so I really don't want to have to manually re-place all of them. Is there anything I can do?

Hi Noah,  You can perform a Roll Back to before the add-on was added.  Go to Roll20.net Click the name of your game Click Settings Click Roll Back Game.  Select a date before the add-on was added.  In the future, I suggest copying your game before adding add-ons.  Which add-on is this? 

Another option if that doesn't work, is to create a new game with  Waterdeep: Dungeon of the Mad Mage, and pull in the 25 maps with the transmogrifier. It shouldn't take very long, and will overwrite the pages with the new tokens. However, that sort of thing shouldn't happen with an addon. Can you identify the addon? You can communicate in a PM, if you don't feel comfortable responding in public. I'd like to try to replicate.

Thanks for the suggestion about a Roll Back. That will probably work. I added  D&D Waterdeep: Dungeon of the Mad Mage (Map & Card Deck Addon) (I just didn't realize that I hadn't added it yet) and  The Haunting of Manor Thessalia (a DM Dave adventure.) Unfortunately it's impossible to tell which one caused it, but I'll do a Roll Back and add them 1 at a time to see what happens then reply here.

I heard back from Roll20 support and apparently the DotMM Card Deck addon is known to cause issues so that's likely what happened. I don't really need it at all, so I'm just going to leave that off.

That is the third Card Deck addon I've seen cause problems of this scale. :(

Ah, you shouldn't need to add either of those. They are already in the module. Those Addons are for folks who just want the assets, and not the adventure. There is a notice on the Marketplace page, but it is toward the end of the text:

That explains why I hadn't added the deck already! I know this isn't technically a bug, but do you happen to know how to call up the Elder Runes deck within the main module?

It should be in the deck category just under the macros