Why not just as a test, try another sample converter
http://www.voxengo.com/product/r8brain/
This one is free and I don't believe there are any limitations on this one. it is not as good as the pro version but it should work.
 
This will take the guess work out of "Is it sonar or is it SOX".

chuckebaby
Why not just as a test, try another sample converter

This one is free and I don't believe there are any limitations on this one. it is not as good as the pro version but it should work.
 
This will take the guess work out of "Is it sonar or is it SOX".

r8brain is where I started, so that's why I was trying SOX. But for sh!ts and giggles I tried r8brain again and still get the same result. As you can see I got identical results between r8brain and SOX. You cannot rule out that r8brain is using the SOX library. If I were going to write r8brain and there was already an open utility library, I sure wouldn't reinvent the wheel!
 
ORGINAL WAV FILE
Input File : 'Shes_Got_You, Barb vocal , Mix (587)BAK.wav'
Channels : 1
Sample Rate : 44100
Precision : 25-bit
Duration : 00:02:24.21 = 6359591 samples = 10815.6 CDDA sectors
File Size : 25.4M
Bit Rate : 1.41M
Sample Encoding: 32-bit Floating Point PCM
 
CONVERTED TO 48k WITH SOX
C:\......\Audio>sox --i "Shes_Got_You, Barb vocal , Mix (587).wav"
Input File : 'Shes_Got_You, Barb vocal , Mix (587).wav'
Channels : 1
Sample Rate : 48000
Precision : 25-bit
Duration : 00:02:24.21 = 6922004 samples ~ 10815.6 CDDA sectors
File Size : 27.7M
Bit Rate : 1.54M
Sample Encoding: 32-bit Floating Point PCM
 
CONVERTED TO 48k WITH r8brain
C:\.......\Audio>sox --i "Shes_Got_You, Barb vocal , Mix (587).wav"
sox WARN wav: wave header missing extended part of fmt chunk
Input File : 'Shes_Got_You, Barb vocal , Mix (587).wav'
Channels : 1
Sample Rate : 48000
Precision : 25-bit
Duration : 00:02:24.21 = 6922004 samples ~ 10815.6 CDDA sectors
File Size : 27.7M
Bit Rate : 1.54M
Sample Encoding: 32-bit Floating Point PCM

I downloaded Gold Wave as was suggested here by Cactus Music and used that to convert my wav files. Got the same result! (BTW, Gold Wave has a decent user interface and the easiest to use of the tools I've tried so far for converting audio files). 
 
Another thing I've tried is after converting the files, I renamed the Audio folder so Sonar couldn't find the files and then I invoked the command to reattach the files hoping that whatever parameter might be preventing the files from being fully rendered in the Sonar clips would get regenerated. Did not work.
 
Trolling again for ideas, Sonar buddies. This seems like a Sonar bug to me. It shouldn't be this hard!
 
Paul

Well, I gave up and just did the least painful grunt work way as was suggested by Milton on a different thread:

Milton
Solved. I had to save my project as a "Template" in the templates folder (without deleting any audio clips!). I then started a 'new' project (with a new project name) using the just saved template but setting the new sample rate to what I needed e.g. 96KHz to 48KHz etc. Then after opening the newly created project I deleted all audio clips and then saved it again to the same "Templates" folder as previously in order to be able to use this new template at the new sample rate for future projects. Seems like a long solution, but it worked. This allowed me to keep all my tracks, buses, project views, etc. without having to re-build my project from scratch. Sure hope Cakewalk makes this task easier in a future update. They need to see how Cubase Pro handles this (much easier and quicker).

I agree with Milton that Cakewalk needs to address this. It looks like to me that there is some parameter attached to Sonar clips that contains the total number of samples and this parameter does not get regenerated if the sample rate is changed in the project.