SQL Server R2 Service Pack 2 (SP2 Build 10.50.4000.0) is available:

http://www.microsoft.com/en-us/download/details.aspx?id=30437

List of the bugs that are fixed in SQL Server 2008 R2 Service Pack 2
http://support.microsoft.com/kb/2630458

I wish you a nice day,
tosc