Just set my avatar. Your items shouldn't get messe dup. It looks like its failing to connect to the databases with inventory and linden balance, and the connection between servers may be borked. I'd except a full take down of anyone left on, and a few hours of fixing, minimum. But your items should be fine, and linden balances.
Stay calm, dont panic. Everytime they introduce a new feature, this is why I call it a downgrade instead of up. Kinks to work out that weren't worked on sufficently.