Atze (host) and I just tried again on r4357. Now the names of the files you download when joining have changed.
Previously:
megaglest-saved-client.xml
megaglest-saved-client.zip
Now:
megaglest-saved-client.zip
megaglest-saved-server.zip
After clicking "Play now!" the game now stalls for some seconds on the client. That's probably while the server is taking a savegame and compressing it. This used to be faster, I think, and if it will keep freezing then it would be good to post a message to the client saying "please stand by, dumping, downloading and restoring savegame" or something. It's also unclear whether the download of megaglest-saved-server.zip (second file) finishes before the join process starts. (It probably does but the download is quick.)
Screenshot: