Game works fine in local mode. I have many maps. They work fine when I start an offline game.
I configured my server settings to run P2P. I am able to launch the game and join my room. With two separate instances of VASSAL as two different players even. But in either case, none of the maps work. When I click a map button, I get a blank window.
This is all running on the same computer. i.e. offline and online tests are on the same machine, as is the P2P server.