On Sat, 18 May 2013 17:44:32 +0100, J. P. Gilliver (John) wrote:

M$ explicitly stated that the user needs to uninstall it, even if there
are no problems.

How is the user supposed to become aware of that?

Ask M$. I was made aware of the problem through the RSS-feed of
security.nl. They pointed to M$'s solution:

http://support.microsoft.com/kb/2839011/en-us

It clearly states:

| We recommend that customers uninstall security update 2823324 and then
| install security update 2840149. This article provides multiple methods
| to uninstall the update.

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