Hi Michel,
It was a solid Memory light and and solid Error light. The thing that was unusual was that when the system stopped working, it also stopped the dedicated Airport Express that it was connected to (that also had to be restarted to bring back online). I've had the Airport for a few months with no problems, so I don't think it is the cause. I also noticed that after the first upgrade the system was slow to respond or failed to respond when I attempted to connect to it.
On the upside, I reloaded 2.6.4 last night and restored from a backup and the system ran all night without problems (Yea!). It also is responding immediately when I connect (appears to be acting normal again). I'm starting to wonder if maybe the upgrade failed or did not complete correctly, since everything seems to be stable again. I only have minimal programs enabled for the moment and will start bringing them back this evening.
Hopefully this is resolved. if the system starts misbehaving again I will set to a Static address as suggested, but for the moment I think I will leave it alone. At least until this evening when I continue torturing it as I always do.
I still am extremely happy with the 99i Pro and still remain amazed at the ease of use, I just consider this a bump in the road. Thanks for the quick response, and I will let you know if the problem continues.
Thanks,
Eddie