Xcode 4 Instruments doesn't show source lines

Question

I\'ve just started playing with Xcode 4, and found that, no matter how I setup debugging symbols in the project, Instruments refuses to display source lines for stack trace item

Answer 1

I found out what the issue was, as I had the exact same problem.

The answer comes from: Missing symbol names when profiling IPhone application with Instruments

1. Ensure that you have compiled your code with debug flags enabled (e.g. -g3).
2. Execute dsymutil on your binary/dynamic library that you want to be able to access the debug information for.

This generates a dSYM bundle folder, and when indexed by Spotlight the debug information necessary is made available to Instruments.

I suppose in your case, it took some time before Spotlight had things indexed - and when it had, then things magically worked out.