Was it working when you had the .1 address. This isn't really a "mac" problem, its just networking in general.
If it was, any specific reason your changing it? Sorry for questions to your questions, but it does help to figure out whats going on.
In the mean time. I would just turn on DHCP and let the "router" (the Airport extreme) assigned the IP it wants. Get that working first. You can see what IP the Apex gets assigned on the controller itself, I think under setup. Also see what port number it's using, sometimes if it's other then port 80, you have to type in the port number. e.g. 10.0.1.1:8080 where 8080 is the port which is showing on the apex.