I've tried the upgrade in my development environment and this has largely worked other than the fact that the API command "listHosts" seems to now be broken. I've also tried doing a clean install of 3.0.2 and then restoring a backup copy of my MySQL DB of the 2.2.14-3.0.2 upgrade and still encounter the same issue.
I've opened a bug report here:http://bugs.cloudstack.org/browse/CS-14846 Just curious if anyone else has tried this and have had this work successfully.
