A planned patch for one of the security fixes released earlier this month will be delayed as Microsoft continues testing to insure it works properly.
MS06-042 was fairly comprehensive, plugging multiple holes in Internet Explorer 5 and 6, several of which could allow for remote code execution. However, a problem emerged within days.
Internet Explorer 6 with Service Pack 1 would randomly crash when using HTTP 1.1 connections on a system running either Windows XP with Service Pack 1 or Windows 2000, Service Pack 4. IE 6 and Windows XP are both on their second service packs.