If the April updates are working well, there is no need to reinstall the MS06-015 security update.  As a limited number of users were impacted, Microsoft is addressing this with a release.  This can be found as follows:

MSRC Blog Posting - This is Great site to bookmark for Patch news & info
http://blogs.technet.com/msrc/archive/2006/04/21/425838.aspx

When the update is re-released, it's going to be very much targeted to people who are having the problem, or people who have not installed MS06-015 yet. That means if you have already installed MS06-015 and are not having the problem, there's no action here for you.