Hi, Just joined this forum to add my comments to this. I've also now lost Nitro - I am running Snow Leopard, with Logic 9. Nitro is the non-ilok protected version. It just doesn't appear amongst the list of plug-ins, even though it is shown under AU Manager and it is ticked, etc.
Just to confirm - Nitro passed validation - it's just no longer available in the list of effects, and when I open a project where it has been used previously, I am being told that "Nitro is not available". Annoyingly, I've just mixed 5 tracks using, amongst other things, Nitro.
I will hold off doing any more work on these projects - an update on this situation would be very nice.