Hello
I had to report it before and decided now because is annoying. Debugger in VS works maybe in 10% cases, mostly it show strange values or unknown values. Check picture and attached project. Only way to debug is to use NSLog for iOS. It will be nice and speed up if dbg will works 
project:
debuggerCase.zip (117.2 KB)
[EDIT]
One more thing. Trying to set new breakpoint while app is debugged, causes that is not possible set any breakpoint anymore. It happens too after ~10 project compilations/app runs. Only VS restart help. It maybe related with my post about memory leaks.
b.r.