A user reported a non-reproducible crash in the heartbeat thread while my app 
was showing an alert window with a progress indicator.  In list archives I've 
read that this may be due to (a) a memory management bug in my code or (b) a 
bug in Mac OS X.  Both of these seem unlikely since I've been shipping that 
code for 5 years, and the bug in Mac OS X was back in 2004.

Any ideas?

Thread 3 Crashed:: com.apple.appkit-heartbeat
0   com.apple.CoreFoundation            0x94b28dfe CFStringCreateWithFormat + 46
1   com.apple.CoreFoundation            0x94b63b09 __CFAllocateObject2 + 89
2   com.apple.CoreFoundation            0x94c463e9 +[__NSArrayM __new:::::] + 73
3   com.apple.CoreFoundation            0x94b63a06 -[__NSPlaceholderArray 
initWithCapacity:] + 134
4   com.apple.CoreFoundation            0x94b29286 CFArrayCreateMutable + 198
5   com.apple.AppKit                    0x91c2b0bb -[NSFocusState 
addSpecialGStateView:] + 57
6   com.apple.AppKit                    0x91c2ae05 -[NSView 
_focusInto:withClip:] + 1608
7   com.apple.AppKit                    0x91c2a08e -[NSView 
_gatherFocusStateInto:upTo:withContext:] + 175
8   com.apple.AppKit                    0x91c2a028 -[NSView 
_gatherFocusStateInto:upTo:withContext:] + 73
9   com.apple.AppKit                    0x91c2a028 -[NSView 
_gatherFocusStateInto:upTo:withContext:] + 73
10  com.apple.AppKit                    0x91c29d3b -[NSView 
_focusFromView:withContext:] + 566
11  com.apple.AppKit                    0x91c2942e -[NSView lockFocusIfCanDraw] 
+ 517
12  com.apple.AppKit                    0x91dd26e9 -[NSProgressIndicator 
heartBeat:] + 1688
13  com.apple.AppKit                    0x91dd1e87 -[NSUIHeartBeat 
_heartBeatThread:] + 1929
14  com.apple.Foundation                0x99252318 -[NSThread main] + 45
15  com.apple.Foundation                0x9925229b __NSThread__main__ + 1396
16  libsystem_c.dylib                   0x940e6557 _pthread_start + 344
17  libsystem_c.dylib                   0x940d0cee thread_start + 34


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