Audio Metronome stopped working when settings were modified & all FX were bypassed

Encountered an interesting thing yesterday during tracking - changed my audio metronome setting (just changed the type of sound it was using and DB level) and it wouldn't work after that.  Tried resetting audio engine, restarting Sonar, checked it was still routing properly to the metronome bus and wasn't muted, etc.. all to no avail. 
 
Since I was tracking, I had all FXs bypassed, using the FX bypass button.  I clicked it again, temporarily enabling all FXs and the metronome worked again.  Bear in mind, I wasn't using a MIDI device for an eternal click, I was definitely using the internal audio metronome.  I recreated this issue a few times to be sure - if the disable FX button is enabled, any modification the audio metronome settings causes it to stop working.  Re-enabling all FX (or re-enabling them and immediately disabling them again straight away - either is fine) causes it to start functioning again.
 
Can someone else confirm this issue manifests itself on their DAW?  If so, I'll fill out a bug report.

Nope -  I was using the 'internal audio metronome' option, not a synth mapping.  When changing the settings, all I needed to do to recreate the issue was to change one of the sounds to a sound already working.  For instance - in 4/4, the first click is a higher click and the subsequent 3 are a slightly lower pitch (and I had the first click set at a slightly higher volume to make it stand out).  This is the way I've always used it for years.  Just changing the initial click to be the same sound and volume as the remaining 3 (which were functioning fine), caused it to suddenly stop working.

Thanks for confirming Brundlefly - I'll submit a bug report to the bakers.