After Security update 2006-002, RAM is halved

Question

Hi,
Right after applying the Security Update 2006-002, I experienced a freeze upon wake-up from sleep. And a general application slowdown.
A fleeting look past the About this Mac window surprisingly revealed that the system now identifies the two additional (trusty for 8 months or so) OWC 1GB RAM modules as 512kb only. Startup memory test is reported as failed - But the modules are still listed as OK.)
I tried putting the modules in another bank. This works, after restart memory is identified correctly and system breezes. Unfortunately, another restart brings things back to the original, 1.5GB state.
Resetting nvram (reset-nvram, set-defaults, reset-all) in OF also mostly has the same effect: First restart restores things back to normal, second restart brings the problem back.
Having read about the recent PB problems where a system update aparently disabled one memory slot, something tells me it's not the RAM modules themselves. (Yes, they check out fine in memory tests.)
Any ideas?
Best,
Ben

Answer 1

Problem disappeared after I caved in and bought new RAM (Kingston Value Ram) as recomended by / from a local dealer. I am inclined to think this in fact was a defect in the RAM modules themselves, OWC has issued a RMA on them and I'm sending them back. Thanks!