Seems such a simple thing.  Go to metronome settings, choose an audio output, apply and you should be good to go.  I cannot get my metronome to play in my Platinum program.  I have tried every possible output port that is available, to no avail.
 
Any ideas?
 
Thanks
 
Van

Make sure SONAR is seeing the folder where the audio metronome beats (wave files) are stored.  The Metronome folder should be in Cakewalk Content, as defined in Preferences>Folder Options.  If it's not there, you might try a search for (say) "Sidestick 2.wav."  If you find it, determine where it is and add that folder to your Cakewalk Content folder.  If you can't find it, you might reinstall SONAR (with that folder defined as you want it) and see if it appears.

For Platinum, the audio metronome files are in %appdata%\Cakewalk\SONAR Platinum\Metronome
 
If the files are not there, they may be restored by holding down the SHIFT key while starting SONAR.

Try toggling(turning off/on) the FX over ride button in the control bar.
If I remember correctly there has been a bug which silences the metronome.

Yes - it could be something as simple as toggling on and off the audio engine

What Chuck said. Every time. 

Is it on? Set to 'during recording', or 'playback', or both?

Most likely what Greg said.  The buttons for metronome playback are located next to the time window in the Control Bar when the Transport tool is set to large.  Otherwise you will have to check the appropriate box(es) under the Metronome Preferences.
 
Kind regards,
 
tecknot

I could be wrong but im guessing it's the FX over ride (in the Mix module). It typically happens when changing metronome settings or sometimes even changing metronome output sources.
 
Been a known issue for a few years now-
 
2015
http://forum.cakewalk.com/FindPost/3314370
2016
http://forum.cakewalk.com/FindPost/3453041
2017
http://forum.cakewalk.com/FindPost/3659429
 

To All,
 
Thank you for your suggestions.  I was hoping Chuck's idea of toggling back and forth would work based on what appears to have worked with others that have had the same problem.  I turned on the metronome, played, nothing.  Turned on and off the global FX override in the Mix Control Panel, still no sound.  Turned on and off the Audio Engine, nothing.  Looked at Cakewalk Content / Sonar Platinum / Metronome File that was located in the same directory as the rest of the Cakewalk files.  Everything (eg all the sounds) appeared to be there.
 
I went back on my same computer and called up my old Sonar Producer program, and an old file there.  Metronome worked fine.
 
Any other ideas?  If you do, can you please be very elementary in describing step by step how to do what you are suggesting.  
 
Thanks for your time and efforts in trying to help me. 
 
Van