I recently formatted and reinstalled Ubuntu 10.04 , succeeded by Gnome-Do (latest stable version). Gnome-Do automatically exits after 5 min something of its start whithout giving any errors. Sometimes, after selecting any plugin too. It was working fine with previous version of Ubuntu i was using till last week.
Similar problem I saw posted on Launchpad with no solution till now.
https://bugs.launchpad.net/ubuntu/+source/gnome-do/+bug/596206
Here's the dump file