I installed Sonar Platinum a little bit ago. So I record something, a C major arpeggio in this case. It records fine, plays back fine. Clicking on each note triggers the correct note pitch, etc. I double clicked on  the C note to bring up the dialog box that shows that it's C5 which is correct. Look at the keyboard to the left! The starting C note is sitting on the E below middle C! If I click that E note it sounds that E note. But the note sitting on that lane is middle C. Obviously this is a huge issue as I can't really edit anything like this. All my old files have this same problem now. I might also point out the obvious, that the white keys are sitting on grey lanes and the black keys are sitting on white lanes. Messed. Up.

Anyone else see anything like this?

Yes. I have noticed this as well. You have to watch the note name that appears over the keyboard. Not the key. It is pretty far from visually accurate.

Is this a change since X3? Any drum maps?

DaveWaltonMusic
I can't really edit anything like this...  I might also point out the obvious, that the white keys are sitting on grey lanes and the black keys are sitting on white lanes.

I think you just solved your problem... Go by the lane shading instead of the keyboard.
 
Sorry, just shaking your tree. Some others have mentioned this, but I thought it was only temporary, and that vertical zooming fixed the alignment. I haven't seen it, myself.
 
EDIT: Here's a link to a post in the relevant thread in the Problem Reports forum where it was mentioned that scrolling the vertical zoom after initially opening a new PRV fixes it:
 
     http://forum.cakewalk.com/FindPost/3154928
 
Sounds like you should avoid closing/reopening the PRV and use the track picker in the mean time.

Oh wow thanks!! Yes, one of the things I did last night (that I obviously hadn't done with Sonar Platinum before) was to change the zoom. Apparently a display bug where the keyboard doesn't zoom to the correct size along with the rest of the page. 

Anyway, I opened the midi editor thing, just zoomed in and out (just to refresh the page) and *TA DA!*... everything lined up like it should. 

Thanks again. MUCH appreciated!

Did that change permanently fix the alignment issue, or did the alignment come back in a later Sonar session?