Thanks MrViggy. I tried to follow the instructions as posted. A MicrosoftPublicSymbols directory now appears where I set it with numerous *.pdb files. Now the Call Stack is clearly different but the same disassembly comes up.
Call Stack repeats
Code:
	ntdll.dll!_RtlDispatchException@8()  + 0x8 bytes	
 	ntdll.dll!_KiUserExceptionDispatcher@8()  + 0xe bytes	
//..
Still puzzled and wondering why I never heard of these debugging symbols in 10 + years of programming VS. This was supposed to be Visual Studio 2010 Ultimate but apparently it's only penultimate. : )