Are the installs using different org names in 3.0? One thing to understand about multi-tennancy is that if the same underlying SQL DB is being used, then both orgs will be available from both web ervers, but only 1 will be the "default" org. Open Deplyoment Manager and look to see if both org names are present itn he list. Also, try accessing the 2nd org by specifiying the orgname in the URL: http://server/orgname. By default, when you access the server w/o an org name, it redirects to the default org.