My suggestion is to let technical support do the upgrade for you. On several occasions in the past I had some problems when upgrading. This time after reading about all of the problems some users have had I scheduled an appointment with technical support and the upgrade was accomplished without any problems and the system works fine. In fact, version 6.0.9 rarely crashes like earlier versions. It's a lot easier to let tech support log on to your server and sit back and watch. After the upgrade was finished on my server I did the upgrade on the client computers.
