I use to be be able to just click on the record button and I could hear my live microphones.  Now I also have to click
on the input echo, which I really do not want to do.
 
My system includes a Lynx Aurora 16 attached to a Lynx AES16e
 
I am wondered what I did in my Lynx drivers sofware of Sonar software that could have made this clicking on input echo necessary to hear the monitoring?

THANKS,
AB

That seems odd. If you were direct-monitoring with the Lynx, it wouldn't even have been necessary to arm a track to hear the input, and separately enabling Input Echo is always necessary if you're not direct-monitoring.  The arming status of a track shouldn't have any bearing on what you hear either way.
 
 
 

Yup, what brundlefly said,, check the lynx mixer, I have experienced the mixer dropping my settings and have to redo my routing, make sure you have the latest Lynx Mixer, and firmware on your aurora and aes16e, 
that solved that issue for me