Antonio, please file a bug, this sounds like a system issue, not an issue in 
your code.

Kevin

On 16 May 2012, at 09:31 , Antonio Nunes <devli...@sintraworks.com> wrote:

> I should add that all the reports I have received come from 10.7.4 systems, 
> so it looks like 10.7.4 may have introduced a new issue in the auto layout 
> system. This would also explain why the issue did not come up until a few 
> days ago.
> 
> -António
> 
> On 16 May 2012, at 07:02, Antonio Nunes wrote:
> 
>> I have an app whose current version has been out for over a month. Now, 
>> since yesterday I received 6 layout constraint related exception reports 
>> (from 6 different users) with the signature shown below.  I find that  a bit 
>> strange, since layout constraints are not date/time based, so why would they 
>> start to appear suddenly and frequently, and not since the release of the 
>> latest version? Has anyone else started seeing similar reports over the last 
>> few days?
>> 
>> - António
>> 
>> May 15, 2012 5:34:22 PM: *** Assertion failure in 
>> -[NSAutoresizingMaskLayoutConstraint _setSymbolicConstant:constant:], 
>> /SourceCache/AppKit/AppKit-1138.47/Layout.subproj/NSLayoutConstraint.m:596
>> May 15, 2012 5:34:22 PM: Constant is not finite!  That's illegal.  
>> constant:-inf
>> May 15, 2012 5:34:22 PM: (
>>      0   CoreFoundation                      0x00007fff93486f56 
>> __exceptionPreprocess + 198
>>      1   libobjc.A.dylib                     0x00007fff90a56d5e 
>> objc_exception_throw + 43
>>      2   CoreFoundation                      0x00007fff93486d8a 
>> +[NSException raise:format:arguments:] + 106
>>      3   Foundation                          0x00007fff8e54e71f 
>> -[NSAssertionHandler 
>> handleFailureInMethod:object:file:lineNumber:description:] + 169
>>      4   AppKit                              0x00007fff905d16c1 
>> -[NSLayoutConstraint _setSymbolicConstant:constant:] + 162
>>      5   AppKit                              0x00007fff905cd26f 
>> +[NSAutoresizingMaskLayoutConstraint 
>> constraintWithItem:attribute:relatedBy:toItem:attribute:multiplier:constant:]
>>  + 371
>>      6   AppKit                              0x00007fff905cf5e1 
>> +[NSLayoutConstraint constraintWithItem:attribute:relatedBy:constant:] + 41
>>      7   AppKit                              0x00007fff905d79ef 
>> -[NSView(NSConstraintBasedLayout) _constraintsEquivalentToAutoresizingMask] 
>> + 2355
>>      8   AppKit                              0x00007fff905d5b97 
>> -[NSView(NSConstraintBasedLayout) _updateAutoresizingConstraints] + 58
>>      9   AppKit                              0x00007fff9045a2f8 -[NSView 
>> updateConstraints] + 55
>>      10  AppKit                              0x00007fff9045a24e -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 151
>>      11  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      12  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      13  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      14  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      15  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      16  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      17  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      18  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      19  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      20  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      21  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      22  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      23  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      24  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      25  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      26  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      27  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      28  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      29  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      30  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      31  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      32  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      33  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      34  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      35  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      36  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      37  CoreFoundation                      0x00007fff93414cb4 
>> CFArrayApplyFunction + 68
>>      38  AppKit                              0x00007fff9045a226 -[NSView 
>> updateConstraintsForSubtreeIfNeeded] + 111
>>      39  AppKit                              0x00007fff905d5111 
>> __-[NSWindow(NSConstraintBasedLayout) 
>> updateConstraintsIfNeeded]_block_invoke_1 + 133
>>      40  AppKit                              0x00007fff905ccb10 -[NSISEngine 
>> withAutomaticOptimizationDisabled:] + 57
>>      41  AppKit                              0x00007fff905d5086 
>> -[NSWindow(NSConstraintBasedLayout) updateConstraintsIfNeeded] + 132
>>      42  AppKit                              0x00007fff8fe1b931 
>> _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints + 396
>>      43  CoreFoundation                      0x00007fff934468e7 
>> __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
>>      44  CoreFoundation                      0x00007fff93446846 
>> __CFRunLoopDoObservers + 374
>>      45  CoreFoundation                      0x00007fff9341baf9 
>> __CFRunLoopRun + 825
>>      46  CoreFoundation                      0x00007fff9341b486 
>> CFRunLoopRunSpecific + 230
>>      47  HIToolbox                           0x00007fff8dbb24d3 
>> RunCurrentEventLoopInMode + 277
>>      48  HIToolbox                           0x00007fff8dbb96d3 
>> ReceiveNextEventCommon + 181
>>      49  HIToolbox                           0x00007fff8dbb960e 
>> BlockUntilNextEventMatchingListInMode + 62
>>      50  AppKit                              0x00007fff8fddfe31 
>> _DPSNextEvent + 659
>>      51  AppKit                              0x00007fff8fddf735 
>> -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
>>      52  AppKit                              0x00007fff8fddc071 
>> -[NSApplication run] + 470
>>      53  AppKit                              0x00007fff90058244 
>> NSApplicationMain + 867
>>      54  PDF Nomad                           0x000000010351c6f4 PDF Nomad + 
>> 5876
>>      55  ???                                 0x0000000000000002 0x0 + 2
>> )
>> 
>> 
>> --------------------------------------------------------
>> Today you are You, that is truer than true.
>> There is no one alive who is Youer than You.
>> Today I am Me, and I am freer than free.
>> There is no one alive who is Me-er than Me.
>> I am the BEST I can possibly be.
>> 
>> --Dr. Seuss
>> --------------------------------------------------------
>> 
>> 
>> ----------------------------------------------------
>> It isn't so important to do great things,
>> as to do what you do with great love.
>> ----------------------------------------------------
>> 
>> 
>> 
>> 
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> 
> -----------------------------------------------------------
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> 
> 
> 
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