This looks like a bug in AppKit but I'm not sure. Any ideas? (I cannot
reproduce the problem.)
Thanks.

2010-01-23 17:34:40 +0000: *** Terminating app due to uncaught
exception 'NSGenericException', reason: '*** Collection  was mutated
while being enumerated.{type = mutable dict, count = 4,
entries =>
        1 : {contents = "NSFont"} = "LucidaGrande 12.00 pt. P [] (0xa36c80)
fobj=0xd13210, spc=3.80"
        2 : {contents = "NSColor"} = NSNamedColorSpace System controlTextColor
        5 : {contents = "NSOriginalFont"} = "LucidaGrande 12.00 pt. P []
(0xa36c80) fobj=0xd13210, spc=3.80"
        6 : {contents = "NSParagraphStyle"} = Alignment 0, LineSpacing 0,
ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent
0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0,
LineBreakMode 0, Tabs (
    28L,
    56L,
    84L,
    112L,
    140L,
    168L,
    196L,
    224L,
    252L,
    280L,
    308L,
    336L
), DefaultTabInterval 0, Blocks (null), Lists (null),
BaseWritingDirection -1, HyphenationFactor 0, TighteningFactor 0.05,
HeaderLevel 0
}
'
*** Call stack at first throw:
(
        0   CoreFoundation                      0x9476a40a __raiseError + 410
        1   libobjc.A.dylib                     0x97713509 objc_exception_throw 
+ 56
        2   CoreFoundation                      0x947b4579
__NSFastEnumerationMutationHandler + 377
        3   CoreFoundation                      0x94704b05
-[NSMutableDictionary addEntriesFromDictionary:] + 165
        4   Foundation                          0x906d6ee8
-[NSMutableAttributedString addAttributes:range:] + 318
        5   AppKit                              0x9567cd31 -[NSTokenFieldCell
_attributedStringForRepresentedObjects:] + 1539
        6   AppKit                              0x9567ade3 -[NSTokenFieldCell
_unformattedAttributedStringValue:] + 111
        7   AppKit                              0x951235ff -[NSCell
attributedStringValue] + 180
        8   AppKit                              0x950d8643
__NSGetStringAndAttributesFromTextCell + 83
        9   AppKit                              0x950d7ec1
_NSGetTextCellBoundingRect + 157
        10  AppKit                              0x950d7dcb -[NSCell
cellSizeForBounds:] + 337
        11  AppKit                              0x95120836 -[NSTextFieldCell
cellSizeForBounds:] + 504
        12  AppKit                              0x9507b1b8 -[NSCell cellSize] + 
71
        13  AppKit                              0x9507b052 -[NSControl 
sizeToFit] + 46
        14  myProject                            0x000540c4 0x0 + 344260
        15  myProject                            0x00042a96 0x0 + 273046
        16  Foundation                          0x906838d8 -[NSThread main] + 45
        17  Foundation                          0x90683888 __NSThread__main__ + 
1499
        18  libSystem.B.dylib                   0x93494fbd _pthread_start + 345
        19  libSystem.B.dylib                   0x93494e42 thread_start + 34
)
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