Xcode 4 debugger breaks in wrong file

I have been searching for this problem for months in Google & Bing. Here's the thing:

1. I set a breakpoint in my .m file somewhere.
2. I run it.

3. The debugger just stops in a weird file like below:

   0x00003204  <+0068>  ldr.w  r1, [pc, #1000] ; 0x35f0 <-[WhatNotesAppDelegate application:didFinishLaunchingWithOptions:]+1072>
   0x00003208  <+0072>  add    r1, pc
   0x0000320a  <+0074>  ldr    r1, [r1, #0]
   0x0000320c  <+0076>  blx    0x34f44 <dyld_stub_objc_msgSend>
   0x00003210  <+0080>  str    r0, [sp, #152]
   0x00003212  <+0082>  ldr.w  r0开发者_开发技巧, [pc, #984]  ; 0x35ec <-[WhatNotesAppDelegate application:didFinishLaunchingWithOptions:]+1068>
   0x00003216  <+0086>  add    r0, pc
   0x00003218  <+0088>  ldr    r0, [r0, #0]
   0x0000321a  <+0090>  ldr.w  r1, [pc, #972]  ; 0x35e8 <-[WhatNotesAppDelegate application:didFinishLaunchingWithOptions:]+1064>
   0x0000321e  <+0094>  add    r1, pc
   

I have tried clean, reinstall Xcode, and today, update to 4.2GM, but it still bothers me.

Can anyone help?

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The debugger has been thrown off for me when the same method is being called on multiple treads. I am also running xcode 4.2. If you can post you code and possible callers that could help get to the bottom of the problem. I also see assembly code when I step past the end of my code.