It could be that your internet connection is breaking up when users are downloading from you. Jazz2 is weird and downloads the level no matter what into your cache folder. Try hosting a private server, where the other user has put battle1.j2l and castle.j2t (or whatever it is called) into their Cache directory. Since these will be the same, it *should* not download, and just connect and join. If that solves your problem, then it might be that users cannot download from you. (If you are using a router and have freed ports, are 10052-10054 free? These are necessary.) It could be that you have a firewall which thinks people are trying to hack and is trying to stop them which messes JJ2 up. (If you have one, try disabling it for a second.) Also, run Jazz with the spy window open (Use xJJ2 or use Start-->Run... and type in | "C:\Games\Jazz2\Jazz2.exe" -spy | [Or whatever your directory is.] To get it off do the same thing but with -nospy.) Anyway, use the spy window and write down everything that you see. Then, when it crashes, see if you can determine anything from your spy window. If you don't know what it means, then post it here, and we might be able to see if it is your Jazz or something else. Also, have you tried reinstalling? (Not sure if that has been told)

~SB