First, it is absolutely 100% possible to take mono tracks, feed them into a stereo bus, and pan the each mono sound wherever you want in the stereo field. You can do this whether you're using a Send to a bus (use the Send Pan control), or directing the track output to the bus (use the track Pan control. If using a send bus, you have to make sure the Pre/Post settings work correctly with the track fader setting. For example, if you want Pan to be determined solely by the Send Pan control, you'll want either the Send set to Pre and the track fader down, or if the Send is set to Post, then you can set the track output to "none" and accomplish the same thing while still be able to use the track fader to control level.
 
There are multiple ways to mess up the routing to give the appearance of what you describe. The track output and send might be active at the same time. You may have hit the phase button by mistake instead of the interleave and now it's not visible, or the pre and post send and track controls may not be in sync.

I think I may have found what is going on.
 
It looks like the audio clips have envelopes in the clips that the X series of SONAR has not been able to place in their own envelope lane.
 
I deleted the existing pan envelope in the track envelope lane and the problem did not go away. I was looking closer at the clips with my tired old eyes and noticed that each of the clips have a PAN envelope. The X series will not let me edit or delete those envelopes. I think that is the root of my problem with PAN issues I am having.

Isn't there an option for "Clip Automation" in the track edit filter?

That was indeed a good catch. I was able to select that automation option and delete the envelopes but there is still something wrong that I am not able to find out.
 
Here is a screenshot of playback with this track fully panned left. Notice the meters, they do not represent a full left pan and it sounds that way too.

http://joyfulnoiseproductions.org/pan.jpg
 

The screen shot does not contain enough information. I still don't know if other sends are in play, the channel output, etc. I think you may not fully understand signal flow within the mixer, this might be helpful: http://www.cakewalk.com/Documentation/default.aspx?Doc=Music%20Creator%206%20Touch&Lang=JP&Req=Mixing.07.html
 

I fully understand I think Craig. I believe I put a good picture up there. I guess the guitar buss is missing. I have zero sends on the track, as shown. And zero sends in the guitar bus. That should not come into play since the track is hard routed to my UFX and is bypassing all busses and everything else.
 
I guess what you did not see is that the meters are even, with no pan even though the pan is set hard to one side. I thought that was a pretty good representation of the issue.

In the image above, the track output is not set to a bus, it appears to be set hardware output

That is what I stated above as hard routed to my UFX.  ;)

I was confused by the thread title. So this has nothing to do with routing mono tracks to buses anymore?

It does to some sort. I was showing that it looks to be track related now. I can change the title to state Track won't PAN correctly. That would be more accurate.
 
The issue is also replicated in my guitar track panning too. That is my biggest frustration right now.