The SMS in my Macbook Pro doesn't seem to work. I just opened up MacSaber and it didn't work.. so I opened up system profiler and it says that it's disabled.
This may seem like a common sense thing, so I apologize in advance, but have you tried rebooting? My MBP got confused just the other day and thought that I didn't have an Airport card installed, but I restarted it and brought it right back. Very strange, but it hasn't acted up since.