xcode 4 debugging shows 'Summary Unavailable' for most objects

Question

Whilst using Xcode 4.0 and trying to debug and see what value is held in what variable - or see what objects are in an array etc, I always seem to get \"Summary Unavailable

Answer 1

This happened to me upon upgrade to xCode 4.3.1.

I found that editting the Run/Debug scheme and changing the Debugger setting in the Info tab from LLDB to GDB fixed the problem.