I opened projects from a few months back. When I add an audio track on an older project and click record, the metronome is right on and no problem. Not the case with the latest project attempt. As explained earlier, I can record along with the metronome for the first take, then when playing it back the metronome is now slightly off. Still looking for a solution. Any other suggestions out there?   

Still waiting for your reply to my answer above.

On that particular project it may be that you'll have to record a click track to work with.  I'd be curious to know if that stays on time throughout.

Bristol, It seems like the audio out metronome gets worse as the project plays. Lynn, How to record a click track? Drum machine?

Bob Bone asked if I was monitoring directly or thru sonar. I think through Sonar as I always have. So, I record along with metronome in time. When listening to play back (along with metronome) the recording is slightly behind the metronome. How to sync?

This is almost sounding like Sonar is not calculating RTL and your playback offset is out. 
 
I would try this test to see if this is the case.
 
Use a audio track with real obvious transient spikes, you can make one by bouncing a midi kick or snare track to audio. Just make sure the source track was quantizied to the time grid. 
Now send this to your main outs of your interface. 
Now unplug your monitor from one output and using a short patch cord patch your output back to your input. This is called a loop back test. 
Insert an audio track below the original track your using for the test. ,,DO NOT ENGAGE INPUT ECHO. set it's source to the inputs you plugged the output cable into. 
Now record the transient track at a nice hot level. Careful with your gain stage here. 
 
Now zoom way in and compare the transients of the 2 tracks, and also see if they start OK but drift over time. 
This was the test I did years ago that showed me how bad my set up was with a Creative Audigy card. Every time gave me different results. What was weird is I hadn't always noticed it and blamed my slow old computer etc. But for me it was drivers. It's been rock solid right on since I started using ASIO interfaces. 
 
There's also this little test that works with ASIO drivers. It uses loop back but sends a little beep. 
http://www.oblique-audio.com/free/rtlutility
 
 
 

Maybe a latency issue.
 
Here is how I monitor if I am recording a drum track to the metronome.
 
Delta 1010 (outs) --> PreSonus Monitor Station (cue out) --> Samson Headphone Amp
 
When I do this , I am not hearing my drums in the headphones only the click so I guess I am technically not monitoring but this really does away with latency issues and I don't need to hear the drums in the headphones.
 
If I was recording something other than drums and needed it tight to the click and didn't want to deal with latency issues I would use the aux out on my mixing board and insert that into the head phone amp and then just balance the backing track or click that is coming from cue on the PreSonus with whatever is being played live.  

IMO, You might have something quirky w/ the particular x3 file.  If you have an earlier version of sonar installed, you might try opening your tune in that version, saving and re-opening in x3.  You'll lose anything that's new to x3, but it might not be much.  And it might fix your sync issue.  I've had stuff like this happen before.
 
A workaround would be to create a clicktrack using HH or drumsticks w/ session drummer or dim pro for a measure or two.  Quantize.  Then freeze.  Then line it up visually if it's not perfect.  Then loop for the entire song.  If that's not syncing w/ your tracks, then your tracks aren't syncing w/ each other and you've got some serious weirdness and you'll probably have to use CW support.
 
Peace,
 
Ian

Thanks for everyone's help in taking time to give an explanation. Working on it ... will update later.

I've tried a few suggestions. Trying to create a drum track ... when I press on the keyboard the sound is slightly delayed. Creates a problem to play along with the metronome.