There may be another thread re: this issue but I cannot find it.
I just powered up my DAW PC to check on a problem in another post.
I did not bother turning on the audio interface. (Tascam FW-1884 firewire).
When Sonar first started, I got the usual 'no audio interface' message.
I tried to open a NEW project. (this always worked before with no AI connected).
Sonar crashed and closed.I tried it 5 times. This is a new behavior.
I normally always have the AI on when booting the PC so this issue may be occurring prior to 2016.4 update as well.
Anyone else seeing this issue?

Hi. I could not replicate on my laptop. I tried to remove my soundcard from SONAR's Audio, Devices in Preferences, and SONAR opened with this message 

(but without any other issues).
All the best.
 

Yes, I had this. Here's a link to the thread.
 
http://forum.cakewalk.com/Sonar-crashing-on-startup-if-interface-not-connected-Solved-Undo-TipoftheWeek-35-m3415897.aspx
 

I also tried and got the "there are no audio devices" message as well.

Tried here also and got the message same as others

Thanks, guys.
Must be my rig. I tried a USB audio device and got the same result as before.
Also I tried opening an existing project and got the same result.