Well, Java 6 Update 30 is the latest stable version of Java, so Java 7 might
be buggy; note that the current client was developed for Java 5, so it is quite likely that Java 7 caused your problem if you changed nothing else about your system.
Nevertheless, this is a good opportunity to support the developers
by posting the error log and also, checking out whether the new client plus the development tools work with Java 7. So, if you can spare a minute, check out this link:
http://illarion.org/~nitram/downloads/i ... nload.jnlp
With the new client, you can log in to the testserver;
The map editor won't work, but you can check out the easyNPC and easyQuest editor as well.
Any error that might occur can, if you agree, be forwarded to the Mantis bugtracker automatically!