Microsoft has just released the service pack 2 on 26-July-2012 which includes the follwing bug fixes in this service pack:
Service Pack 2 for SQL Server 2008 R2 includes product improvements based on requests from the SQL Server community and hotfix solutions provided in SQL Server 2008 R2 SP1 Cumulative Updates 1 to 5. A few highlights are as follows:
•Reporting Services Charts Maybe Zoomed & Cropped Customers using Reporting Services on Windows 7 may sometime find charts are zoomed in and cropped. To work around the issue some customers set ImageConsolidation to false.
•Batch Containing Alter Table not Cached In certain situations with batch files containing the alter table command, the entire batch file is not cached.
•Collapsing Cells or Rows, If Hidden Render Incorrectly Some customers who have hidden rows in their Reporting Services reports may have noticed rendering issues when cells or rows are collapsed. When writing a hidden row, the Style attribute is opened to write a height attribute. If the attribute is empty and the width should not be zero.
following is the url to download the service pack and KB article for more detail information.