We're working on this issue right now -- there appears to be a memory problem sometimes when you become an UltraPeer. Any more details people can provide as to exactly when you are seeing this behavior would be helpful. Can you definitely not replicate it with the JRE for XP? I only ask because it appears to only happen some of the time on the normal 1.3.1 JRE, and only if you become an UltraPeer with many client connections.

Is anyone experiencing memory issues when you are not an UltraPeer (do not have a lot of client connections listed in your Connections tab, and with your status appearing as "UltraPeer" in the lower left)?

Thanks.