Sounds to me like something (.profile, .bash_profile, .login, .bashrc, .cshrc, 
etc?) is setting those DYLD environment variables under the one account, but 
not under the other.  Ignoring them is legitimate.  DYLD checks using 
issetugid(2) to decide whether to ignore them*.  That's a security issue, since 
they could otherwise be used to cause the privileged program to do something 
other than what it was intended to do, and grant its privileges in a way that 
could be abused.

* For low-level stuff like that, there's a good chance it's open source.  If 
you google for the error message plus site:opensource.apple.gov
you'll probably find the source code reference.  And googling for the error 
message without that certainly finds plenty of references to discussion about 
it.

It's a harmless message, and if there is some legitimate reason for those to be 
set, you can either ignore it, or find the program that actually needed them 
set and create a wrapper script that sets them just for it, so they don't have 
to be set for everything else and generating needless messages (and just 
possibly causing other problems).  Most of the DYLD_ variables should be for 
debugging or working around some problem, NOT for use all the time with 
everything in a session.

As to what changed, no idea.  I'm running Lion (10.7.x), and have never seen 
those messages, although I knew they existed.  I've played with Mountain Lion a 
bit under Parallels too, and don't recall seeing it there either.  So I must 
not have done or installed whatever was setting those.



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