When adding a single item to an empty orderform and running cart.AcceptChanges() we get the following exception. Everything is saved though, when choking the error in a try/catch everything works normal. This error only occurs on some of our test machines. We're using 7.5 without any updates.
EPiServer.Global: 1.2.5 Unhandled exception in ASP.NETSystem.NullReferenceException: Object reference not set to an instance of an object. at Mediachase.Data.Provider.TransactionScope.ThreadStaticTransactionScope.Dispose() at Mediachase.Data.Provider.TransactionScope.Dispose() at Mediachase.Commerce.Orders.OrderGroup.AcceptChanges()
This was a custom metafield on LineItem that wasn't populated. Found the problem using SQL Server Profiler.