Hello John and welcome to the forums.
Firstly, I would advise you to change your user name to something other than your email address, as this will potentially open you up to spammers.
Now, with regards to your issues:
john@bluecollarirons.com wrote:I have a mac with the latest OS. Also my addictive drummer is not working at all. Im just getting a black screen (window) and its the same in the DAWS but the window is a blank white screen.
I believe that this may be a separate problem (though I may be wrong). If you have Addictive Drums 1 then this is a known issue with the software and any macOS newer than High Sierra.
john@bluecollarirons.com wrote: But when I open in FL12 or Reaper Im getting no signal. I can hear my guitar through the speakers being powered by the preamp in the interface but its not going through the AT3.
Do you mean you aren't seeing an input signal in AT3? If so, have you definitely got your interface selected in your DAW?
Or is it that you just can't hear the effect of the sims? Depending on the DAW and type of MBox, is there some kind of direct vs software monitoring that you need to check to hear the output of your DAW?