EXC_BAD_ACCESS when reading file in viewWillAppear

Hi,
When I'm loading my main view in loadView function I show a modal view with list of file names. When the user chooses the file name I show a modal view with password request. If the password was correct, I dismiss password view and in the viewWillAppear of the chooseFileView open the requested file and immediately call
[self.parentViewController.navigationController dismissModalViewControllerAnimated:YES];
in order to return to the main view controller and update it with the data I've got from the file.
For some reason, I get the following stack:
#0 0x925f1907 in __forwarding__
#1 0x925f1a12 in _forwarding_prep_0__
#2 0x964ea20f in NSPopAutoreleasePool
#3 0x30a65502 in _UIApplicationHandleEvent
#4 0x31699522 in SendEvent
#5 0x3169b88c in PurpleEventTimerCallBack
#6 0x92572615 in CFRunLoopRunSpecific
#7 0x92572cf8 in CFRunLoopRunInMode
#8 0x31699d38 in GSEventRunModal
#9 0x31699dfd in GSEventRun
#10 0x30a5dadb in -[UIApplication _run]
#11 0x30a68ce4 in UIApplicationMain
#12 0x00002646 in main at main.m:14
with EXCBADACCESS in
2008-11-13 21:57:28.349 SafeWallet[4822:20b] * -[NSConcreteData release]: message sent to deallocated instance 0x4707d50
How do I trace this exception? I don't have any data of type NSConcreteData. What it can be?
May be all these modal views should be handled in other way?
Thanks,
Nava
P.S. I found on some thread, that I can enable Zombie environmental variables, but how can I see a proper stack on debugger?

Well - I'll shoot straight with you... I hate looking at that stack stuff. I walk paths through my code until I've isolated the problem area - and look at the objects I'm using - it usually revolves around "over-Release]-ing". and remember to break in drawRect and stuff - it's on a separate thread.
I use diagnostics like...
NSInteger huh = [dumbObject retainCount];
and look at that var after i pass through it in debug mode... Odds are I thought I'd retained something after ripping it's lifeless form out of an array and oops... I killed the poor thing.

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