Apple Security Update 2005-007 Inadvertently Kills Native 64-bit Computing in Tiger

according to a note sent 6:28pm EDT yesterday by Wolfram Research, manufacturer of Mathematica, to members Apple's SciTech list, including Macs Only!. The note says in part:

Due to an error on the part of Apple, this update prevents any
64-bit-native application from running. In particular, this means
that Mathematica 5.2 will not run on any G5 system if it has
installed this Security Update.

This problem was discovered by our testing procedures a few hours
ago, and Apple has now assured us that they have stopped
automatic distribution of Security Update 2005-007 at this time.

The note appears to be authentic but we do not have Mathematica 5.2 to confirm the problem. Curiously, the Apple Security Update 2005-007 remains available for download as of publication time, conflicting a bit with the Wolfram Research note. We will post any new information on this issue when it becomes available. [Bill Fox]