MS has recently released SQL Server 2008 Service Pack 3 Cumulative Update 2 Released? which has fixes reported after SQL Server 2008 SP 3, this build version is  10.00.5768.00.

Below are the bugs that have been fixed in this CU:

1. FIX: A backup operation on a SQL Server 2008 or SQL Server 2008 R2 database fails if you enable change tracking on this database
2. FIX: CLR stored procedure returns NULL after it is recompiled in SQL Server 2008 R2
3. FIX: Access violation when you insert a record into a new empty partition in SQL Server 2008

There are few more things we have to keep in consideration while applying this CU:
Pre-install:

1) You should be running on SQL Server SP3, if you haven't installed SP3 for SQL Server here is the link from where you can obtain SP3, Link => http://support.microsoft.com/kb/968382
Post-install:

* It is advisable to reboot the system once CU is applied

Please make sure you test the CU in Dev/QA/UAT environment before you apply it in the PROD environment.

Here is the link from where you can download the SQL Server 2008 SP3 CU2, link => http://support.microsoft.com/kb/2633143/en-us

-- Hemantgiri S. Goswami (http://www.sql-server-citation.com )