Everyone who is crashing the D3 client has this in common in their logs:
ERROR GameEvents System.NullReferenceException: Object reference not set to an instance of an object.
at Trinity.ItemEvents.TrinityOnItemStashed(Object sender, ItemEventArgs e) in c:\path2db\Demonbuddy\Plugins\Trinity\Items\ItemEvents.cs:line 11
at Zeta.Bot.GameEvents.[](EventHandler`1 , Object , )