luckily there's only a few people reporting problems. My 2006 MacBook Pro running 10.6.2 , fully patched , lovingly maintained has suffered a difficult to recover from crash, due absolutely only to this security update. My latest repair attempt with my SL upgrade disk successfully repairs permissions, successfully completes disk first aid repair but when I try and install SL 10.6 , I get the comment
"Mac OS X can't be installed this computer" it further explains that
"this disc requires that Mac OS X 10.5 or later is already installed on your computer" , helpfully there is the option "if you wish to restore the system from a Time Machine backup - click restore"
so it seems that the security update 2010-001 has rendered the MBP totally system-less
My TM backup for this MBP (I have 8 MBP's) is around 3 months old, and I need to know more about the wording "if you wish to restore the system" as I'd very much like to keep my current user data. I'll finish to write my paper - due next wednesday - on my desktop iMac (as yet unpatched!) then either restore 10.4 from my original system disk, update to 10.5, then back to SL 10.6.2 , or I might try the Time Machine.
eitherway , it shows that although my MacBook worked normally great & all my many other shiny pieces of fruit work great !!! don't patch before a significant deliverable!!, (without having a todays TM image and user data backed up on MemStick & another machine). I haven't tried FireWire target disk on my 'trashed MBP' , that would likely be the fastest way back to my data, but happily I kept the parallel working documents on the different systems. (the document will eventually earn my company around 700k euros)