I see, I thought you were saying there was instability on the host. I've just tried to reproduce this ssh'ing from a ubuntu lucid to a ubuntu natty laptop and running firefox, with no success.
Additional information which would help to debug this: 1. The next time this happens, please do 'apport-collect 728017' which should give us more details. 2. Can you give me a particular site which always reproduces this? 3. Please do 'wmctrl -m' and 'wmctrl -lG' on the client and give output here. ('sudo apt-get install wmctrl' if needed to get the program) 4. Please give ps -ef from the client ** Changed in: openssh (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. https://bugs.launchpad.net/bugs/728017 Title: xwindows over ssh causes instability -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs