The additional feedback which would be required relates to hardware configuration:
a) What motherboard
b) What CPU version (perhaps including stepping)
c) What additional cards are installed
I would have expected the "Lock PCI bus" to be a no-op if the AC88 I upgraded to worked properly. Instead, "Lock PCI Bus" made my card go away as far as the system was concerned.
I will be getting back to you with all of this. I'm going to pull the PCE-AC88, put the PCE-AC66 back, reboot, and reconfigure to see what "Lock PCI Bus" does in that configuration. I'll post the results and the model designations of everything in my system when I do that.