We have assembled a new release that addresses a number (30+) of issues that we could not address before the SQL Server 2008 R2 RTM release.  Everyone who is seriously considering Master Data Services or even kicking the tires is encouraged to take this update.  Anyone actively using the product is encouraged to take this release as well.

Here is the location of the KB Article:

http://support.microsoft.com/kb/2143880

Note: This is a full installation msi.  You can install this MSI on a new server or an existing server that runs the RTM version of Master Data Services. If you apply this to an existing server, you will need to update your MDS database by using Master Data Services Configuration Manager after you install the MSI. Open Configuration Manager, and click Upgrade Database to do this.

Master Data Services is a feature of the versions and editions of SQL Server listed in Setup Requirements (Master Data Services). Any computer where you install Master Data Services must be licensed accordingly. For more information, refer to the End User License Agreement (EULA).