A new problem has suddenly appeared this week in our sandboxes. When I update an OpportunityLineItem, my "before update" trigger sees a null value in the PricebookEntryId field. But this is an update to an existing OpportunityLineItem, so it should have an associated PricebookEntry. When I extract the record in the data loader, it does in fact have a PricebookEntryId. This worked flawlessly last week. Our sandboxes run on CS17, and I can see that Winter 15 is released this weekend, so I guess it is related to that release. It seems like a bug in the platform. Does anybody know of a workaround? We are in the finishing phase of a large project, and our UAT testing is heavily impacted by this, since users are no longer able to make any updates to existing OpportunityLineItems.