Paul White (@SQL_Kiwi) follows up on his thorough breakdown of indexed view maintenance with the details of a bug that can render an indexed view incorrect.
Paul White (@SQL_Kiwi) details a regression bug in RCSI caused by a fix for a different bug. If you are running SQL Server 2008 R2, you should read this.
Here is some information about an important MERGE "wrong results" bug, involving indexed views, that could be affecting the accuracy of your queries right now, and what options you have for working around the problem.