I've seen this on two different projects, where the metronome is silent.  Toggling the metronome record/play enable changed the behavior on one project but not the other.  I'm running S Plat 6/16.  I have never seen this before yesterday.  I have updated my system from win 8.1 to win 10 recently.  I checked problem reports and didn't see anything like this.  Has anyone else seen this or having trouble with the metronome being silent?
 
Thanks,
Ken

I've never encountered the 'silent metronome' issue other than due to project config/routing issues, but others have reported problems in the past. IIRC, one recently identified solution was to toggle global FX off/on in the Mix module.
 
If that doesn't get it, you should thoroughly check for various possible config/routing issues:
- MIDI metronome enabled instead of Audio.
- Audio metronome output assigned to wrong bus/port
- Metronome bus muted or some other parallel bus is soloed.
- Parallel send of metronome is going through an aux track with phase inverted, nulling the direct output.
- etc.
 

Yes - that helped me - turn the fx off then back on - and that may resolve it

I just encountered the "silent metronome" too.  Toggling Fx back on/off worked for me.  Had never had this happen before.

It was a gift that arrived earlier this year. 

I had the silent metronome happen to me last weekend which has never happened in over 20 years of using Cakewalk and Sonar.  I just brought the Metronome window and closed it and the metronome was silent.  Tried reloading the project and rebooting and it was still silent.  Rolled back the project to a previous version when it was working and it started working again.

Have the same problem now in platinum 2016.08 no metronome sound on audio outputs.
Uses Tascam US 16x08 only output 1,3,5,7 to choose
But when creating a new project wupti i can choose audio outputs like either audio or mixer,metronome sound and Works ,but not in old created projects  ..... strange

The metronome must have it's output routed someplace. All my projects have a metronome buss and I route it to that. There are a number of metronome options available. If you have it using sampled sounds you have to make sure that the sound files are available. Check all your settings and toggle the master FX button on and off. That should get you going again.

I've had this problem with a couple of projects and nothing I've tried has fixed it. There's a definite bug here. I now have to set up a separate drum track manually to act as a metronome when I start a project.
 
I`ve had every Sonar version since version 1, and it seems to me that since around 8.5 it started getting harder and harder to do anything straightforward with it. I now spend an hour just trying to get a project set up and working, when with earlier versions I was up and running in a minute or two. I get continually frustrated with the stupid `smart`cursor thing -- where before I would click or right-click and know what I was getting, now it`s a mystery and half the time nothing happens.

Looks like the bug is still in 2016.09
Change anything in the Metronome and it goes silent.
Toggle Global FX and it's back.