Reusing Image on Ribbon Causes Crash on XP-Collection of common programming errors

I am using a WPF ribbon and I have just run into some strange behavior. I have a contextual tab which I duplicate some of the functionality from the Home tab so that my users don’t have to click back and forth.

The problem I have seen is that if I reuse an image, my application crashes on start up if running on Windows XP. There is no issue on Windows 7. Any ideas?

Code:

            
                
                
                
            

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.... If I uncomment this next part it crashes on XP....
                

If I take out the LargeImageSource/SmallImageSource part it works fine.