UPDATE - April 2012 SharePoint CU Re-Release April 24, 2012
A recent, isolated issue was discovered in the SharePoint 2010 Products April 2012 Cumulative Update that could result in an HTTP 500 error when users delete objects to include documents, lists, and Webs and a new object is created using the same path where the original object remains in the Recycle Bin.
The following packages were affected:
KB2598151 - SharePoint Server Package
KB2598152 - Project Server Package
KB2598321 - SharePoint Foundation Package
KB2598304 – Wss-x-none.msp
This issue has been resolved in the revised packages. The revised packages include support for resolving issues related to the originally published updates.
SharePoint Foundation 2010
SharePoint Server 2010
We recommend that you test hotfixes before you deploy them in a production environment. Because the builds are cumulative, each new release contains all the hotfixes and security updates that were included in the previous SharePoint Server 2010 update package releases.
Description of the SharePoint Server 2010 cumulative update package (SharePoint server-package): April 24, 2012 http://support.microsoft.com/kb/2598151