Xcode 4.2 showing the wrong line of code on error [duplicate]

Answer 1

Go to the breakpoints panel, and add the bottom left, click the + sign and add an "Exception breakpoint".

Exceptions : All
Break : On throw.

That should solve the problem in most cases.

Answer 2

I do not know how to reclaim the old behavior.

Zane Claes offers a great solution on a similar question here.

Xcode 4.2 debug doesn't symbolicate stack call

After you find what class your app is crashing in you can use the debugger to step through and find the culprit