Why does Xcode 4.2 not show values of variables in debug mode when hovering over them?

Xcode 3.2 showed me the values of variables. Now in Xcode 4.2 when I debug and it stopped in a scope, I can't see the values of variables anymore. The variables view on the lower left s开发者_运维问答ide contains almost nothing useful except the memory adress of an object. When I click the expand-arrow nothing appears there. It's empty.

Must I setup something to make the debugger work properly?

---

Xcode 4 is very finicky with variables in the debug window. You'll probably find that locally defined primitives (ints, floats, strings, etc) will display but nothing else will.

I know its not much help but I usually just add an 'NSLog()' and print the variables I am trying to debug. Not as convenient but it gets the job done.

If anyone else knows a permanent fix id also be grateful.

---

If you right click in the lower left view you can select "Add Expression" and type the name of the variable.

Why Xcode cannot display this information when hovering over is a mystery to me.