no pan to bus

 
I have problems now and then with stereo and mono output, usually self induced from a plugin. Now I'm confused about this situation. I have disabled all fx and prochannel to prevent issues.
I have a synth that whose output in stereo and can't get a mono output from it (able to pan L and R).
I bounce it to a mono clip and solo. Still won't work from the mono clip to the guitar bus.
 
interleave=mono selected
track output is to stereo guitar bus to stereo 2 bus to stereo master (then to speakers)... won't pan
track output is to stereo 2 bus to stereo master... pans work
track output is to stereo master... pans work
Is there something i don't understand?

i made another track using the same VSTi and I get the same results... no panning to that buss.
I made a new bus and no panning to that bus.
Close Sonar and restarted with same results.
Updated Sonar to the 2016.08 version just to see if that helped, but no.

Its possible that the problem may exist in your audio interface output software.

If you are using the track pan make sure to also set the send pan or set the "Follow Track Pan" on the send pan context menu.

all sends are removed... see pic for screenshot of the track.  remember, if I set the output to the 2-buss or master, it pans properly.  (fyi, i moved the guitar fx to the bass bus temp)
 
after doing this, i don't know how to upload a hi-res version of the screenshot so you can really see the details.
 

The only thing I can think of that would cause that would be if the "Guitar Bus" has the "mono" button enabled. . .

Man Im all out of ideas... sorry 😕

wanted to re-verify this so i checked again... 
I made a new bus... Bus I.  Mono track panned to stereo busses Master, 2 bus, bus I sounds normal.  When I say normal, panning full left in the mono track shows as a left signal only in the bus.  
Mono track panned to Guitar bus does not sound normal.  Panning full left on the mono track shows as a stereo signal (L & R) on that bus.  
It's almost like an fx is hidden in the bus, forcing the mono signal to be converted to stereo. 
Later, I tried more options to see if it may be some glitch.  
I clicked on the bus Post-fader and the track pan worked.  I turned it off and put the Kramer Guitar fx mono/stereo plug on the bus.  Track pan didn't work (acted like a stereo bus).  I turned off the fx, and it still acted like a stereo bus.  I removed the fx from the bus, with the same results.  I selected post-fader, and the bus acted normally.  I de-selected the pf button, and the bus remained normal.  
So it seems like the plugin locked the signal to the bus in stereo mode?  
It's getting late so I'll look at it more tomorrow.

If they want to see it, then I can do that... I noticed that this project used my default master template and I can replicate it on other projects using the same template.
 

I would occasionally get a wierd artifact like this when I would open an old session.  Try cloning the track with no details, just the event.  No effects, automation...etc... just the event.  Right click on track 8 - "clone Track" - choose only events.. not automation etc.  Im sure theres a reason... however I never dug deep to figure it out