Open Radar

 
Summary:
Apple's productivity apps, such as Mail will not open the print dialog if any of the printers on the network with Bonjour support use non-ASCII characters in their names. The problem is most evident with mail which consistantly throws an exception when trying to open a print dialog. The problem occurs only with an admin account and only in Apple software, not for instance Office or any Adobe software.

Steps to reproduce:
Name your networked, Bonjour-enabled printer "Mörkö"
Try printing from Mail using an admin account

Expected results:
Printing should work. There should be a printer named "Mörkö" in the Nearby Printers list if it hasn't been added yet.
The printers should also be browsable in System Preferences > Print & Fax > Add printer

Actual results:
The print dialog will either not open at all and throw the following exception:
31.3.2010 13.54.02	Mail[3276]	An exception was thrown '*** -[NSCFDictionary setObject:forKey:]: attempt to insert nil key'. Stack trace:
(
	0   CoreFoundation                      0x00007fff857a1444 __exceptionPreprocess + 180
	1   libobjc.A.dylib                     0x00007fff876ea0f3 objc_exception_throw + 45
	2   CoreFoundation                      0x00007fff857a1267 +[NSException raise:format:arguments:] + 103
	3   CoreFoundation                      0x00007fff857a11f4 +[NSException raise:format:] + 148
	4   Foundation                          0x00007fff87d29a84 -[NSCFDictionary setObject:forKey:] + 164
	5   libSystem.B.dylib                   0x00007fff84c05273 handle_browse_response + 236
	6   libSystem.B.dylib                   0x00007fff84c05047 DNSServiceProcessResult + 717
	7   PrintCocoaUI                        0x00000001188170c5 RunningAsRoot + 84360
	8   Foundation                          0x00007fff87d3785a _nsnote_callback + 167
	9   CoreFoundation                      0x00007fff85749e3a __CFXNotificationPost + 954
	10  CoreFoundation                      0x00007fff857363e8 _CFXNotificationPostNotification + 200
	11  Foundation                          0x00007fff87d2e7c4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 101
	12  Mail                                0x0000000100002611 0x0 + 4294977041
	13  Foundation                          0x00007fff87df9167 _performFileHandleSource + 1254
	14  CoreFoundation                      0x00007fff8573f271 __CFRunLoopDoSources0 + 1361
	15  CoreFoundation                      0x00007fff8573d469 __CFRunLoopRun + 873
	16  CoreFoundation                      0x00007fff8573cc2f CFRunLoopRunSpecific + 575
	17  Foundation                          0x00007fff87d72a24 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 270
	18  Mail                                0x00000001000b1b85 0x0 + 4295695237
	19  AppKit                              0x00007fff8733accf -[NSView(NSPrinting2) _knowsPagesFirst:last:] + 168
	20  AppKit                              0x00007fff87194333 -[NSConcretePrintOperation(NSInternal) _validatePagination] + 198
	21  AppKit                              0x00007fff873a9c8b -[NSPrintPreviewController start] + 811
	22  Foundation                          0x00007fff87d3785a _nsnote_callback + 167
	23  CoreFoundation                      0x00007fff85749e3a __CFXNotificationPost + 954
	24  CoreFoundation                      0x00007fff857363e8 _CFXNotificationPostNotification + 200
	25  Foundation                          0x00007fff87d2e7c4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 101
	26  Mail                                0x0000000100002611 0x0 + 4294977041
	27  PrintCocoaUI                        0x000000011880eacb RunningAsRoot + 50062
	28  PrintCocoaUI                        0x00000001187ff9a4 0x0 + 4706007460
	29  PrintCocoaUI                        0x0000000118800b43 0x0 + 4706011971
	30  PrintCocoaUI                        0x00000001187ff513 0x0 + 4706006291
	31  PrintCocoaUI                        0x000000011880c9ca RunningAsRoot + 41613
	32  PrintCocoaUI                        0x000000011880c2de RunningAsRoot + 39841
	33  AppKit                              0x00007fff86d7795d -[NSWindowController _windowDidLoad] + 538
	34  AppKit                              0x00007fff86d15113 -[NSWindowController window] + 112
	35  AppKit                              0x00007fff87198462 -[NSPrintPanel beginSheetWithPrintInfo:modalForWindow:delegate:didEndSelector:contextInfo:] + 627
	36  AppKit                              0x00007fff87196b51 -[NSConcretePrintOperation runOperationModalForWindow:delegate:didRunSelector:contextInfo:] + 478
	37  Mail                                0x00000001000b095f 0x0 + 4295690591
	38  AppKit                              0x00007fff86e8409a -[NSApplication sendAction:to:from:] + 95
	39  AppKit                              0x00007fff86ea8602 -[NSMenuItem _corePerformAction] + 365
	40  AppKit                              0x00007fff86ea836c -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 121
	41  AppKit                              0x00007fff86e8e009 -[NSMenu performKeyEquivalent:] + 272
	42  AppKit                              0x00007fff86e8cdb1 -[NSApplication _handleKeyEquivalent:] + 559
	43  AppKit                              0x00007fff86d5d9e1 -[NSApplication sendEvent:] + 3630
	44  Mail                                0x00000001000340a7 0x0 + 4295180455
	45  AppKit                              0x00007fff86cf4796 -[NSApplication run] + 474
	46  AppKit                              0x00007fff86ced468 NSApplicationMain + 364
	47  Mail                                0x0000000100002150 0x0 + 4294975824
	48  ???                                 0x0000000000000002 0x0 + 2
)

or sometimes it will open but the UI will be unusable (including not being able to cancel the print operation).
*No* networked printer is browsable in the Printer Browser.

Regression:
The problem only occurs when the user is an administrator and the machine is on the same subnet as the printer. The specific printer model in use was a Xerox Phaser 7750.

Notes:
Even if this turns out to be a compatibility issue with some Xerox printers or a Xerox bug, OS X should handle this situation better than just completely failing to print.