Heyhey, me again with another bug:
When you set the Claimed Area Name to anything, everyone, who enters the chunk with a set name, will crash.

This is a running Console log when this happened:
server-log.txt

This is a client log of the person who crashed the first time:
crashed-client-latest.log

If any more information are needed, please tell me.

Thanks for reporting.
It's already fixed in the latest version though.