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You need to use the "Download TSV" button to download a .txt file; then the map editor can import the file.

I just had this problem pop up myself. Turning off the AdBlockPlus extension fixed it for me....

OK, so for anybody else who's curious the quick approach is to find the section "collisions" and change every  :0 to :1 in that section. Instant cavern walls!

I like to use donjon.bin.sh to generate maps, especially cave maps, and then import them into the map editor. Works great except that the imported file uses square walls instead of cavern walls so I have to manually fix the walls if I don't want the map to look like something out of an Atari 2600.

Because I'm lazy, I figured I'd save the file, pop open the JSON, and see if it were possible to do some sort of batch update with a text editor, but I'm having trouble figuring out the JSON and thought I'd ask if there are any existing resources before I tried to poke at it more.