I have yet to Upgrade G2 without the upgrade corrupting something so it won't run. I was told by a support person that just because there is an update available, if your program is running fine it was not recommended to do the update. Did not make a lot of sense to me but after it happening each of 3 times I've done it, I no longer upgrade even when control panel says an update is available. However, if I really want to upgrade I get in touch with support, whine enough and they make the upgrade available for me to download and do without going over the Internet (doing it via the Internet connection never seems to work even though that is what they want you to do).

Also has anyone ever noted that when you do try to do an upgrade over the Internet, the Primary server is NEVER available. Just one of those interesting Knifedge, jump through the hoops, things.