MFMailComposeController crashing non-deterministically

Question

Hello, I've been struggling with this issue for a few days. I am trying to use the MFMailComposeController to send emails. What's happening is that the program crashes (long stack-trace below) upon clicking the SEND button. However, this is non-deterministic - sometimes it works immediately, sometimes after a long delay, and most often, it crashes. Here's my code for sending:

-(void)mailWithAttachment:(NSString *) fileName 
                 type:(NSString*) attachmentType
                 data:(NSData *) attachmentData {

MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
mc.mailComposeDelegate = self;

if ([MFMailComposeViewController canSendMail]) {

    [mc setSubject:@"my subject"];
    [mc setMessageBody:@"my body" isHTML:YES];

    [mc addAttachmentData:attachmentData 
                 mimeType:attachmentType
                 fileName:fileName];

    [self presentModalViewController:mc animated:YES];
}
[mc release];

}

didFinish result looks like you'd imagine:

-(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    [self dismissModalViewControllerAnimated:YES];

    //...some other actions here for other UI logic, but problem persists if removed
}

And the definition of the class:

@interface ShareViewController : UIViewController { //... }

Here's the stack trace:

#0  0x33568534 in gdb_objc_debuggerModeFailure
#1  0x3356634e in _rwlock_write_nodebug
#2  0x33560940 in map_images
#3  0x2fe0413e in __dyld__ZN4dyldL18notifyBatchPartialE17dyld_image_statesbPFPKcS0_jPK15dyld_image_infoE
#4  0x2fe042d4 in __dyld__ZN4dyldL11notifyBatchE17dyld_image_states
#5  0x2fe0aee0 in __dyld__ZN11ImageLoader4linkERKNS_11LinkContextEbbRKNS_10RPathChainE
#6  0x2fe062d6 in __dyld__ZN4dyld4linkEP11ImageLoaderbRKNS0_10RPathChainE
#7  0x2fe08188 in __dyld_dlopen
#8  0x30c18fd0 in dlopen
#9  0x0000390c in <function called from gdb>
#10 0x3356628e in getMethodNoSuper_nolock
#11 0x335662b8 in _class_getMethodNoSuper_nolock
#12 0x3356518a in lookUpMethod
#13 0x33562914 in _class_lookupMethodAndLoadCache
#14 0x3356264a in objc_msgSend_uncached
#15 0x33562a2a in _class_initialize
#16 0x33567dfe in prepareForMethodLookup
#17 0x33565168 in lookUpMethod
#18 0x33562914 in _class_lookupMethodAndLoadCache
#19 0x3356264a in objc_msgSend_uncached
#20 0x32b2c288 in +[NSTimeZone(NSTimeZone) defaultTimeZone]
#21 0x32b2c246 in -[NSCalendarDate initWithTimeIntervalSinceReferenceDate:]
#22 0x32b3beb4 in -[NSDate(NSCalendarDateStuff) descriptionWithCalendarFormat:timeZone:locale:]
#23 0x323642fc in -[NSDate(Goodies) descriptionForMimeHeaders]
#24 0x32a6e812 in -[MailComposeController headersUseSuspendInfo:]
#25 0x32a71e38 in -[MailComposeController messageUseSuspendInfo:endingEditing:]
#26 0x32a6e594 in -[MailComposeController _getMessage:]
#27 0x32a6e536 in -[MailComposeController message]
#28 0x32a72bcc in -[MailComposeController deliverMessageRemotely]
#29 0x32a7cab0 in -[_MFMailComposeRootViewController mailComposeControllerCompositionFinished:]
#30 0x32a6e0a0 in -[MailComposeController sendMessage]
#31 0x32a7086a in -[MailComposeController send:]
#32 0x32c29ffa in -[NSObject performSelector:withObject:]
#33 0x32a661cc in -[MailComposeView _sendButtonClicked:]

I've tried the MFMailComposeController as a child of different views with the same result. Can anyone advise? I'd really appreciate it!