I just realized that there is a bug in my +QSWStandardizedSystemVersion method 
that explains the crash. The fault is NOT the -objectAtIndex: message. It is 
instead the 3 
versionComponentStrings[x] subscripted messages, which of course compile to 
-objectAtIndexedSubscript:. I was thinking of versionComponentStrings as a C 
array when it is actually an NSArray object.

    NSArray *versionComponentStrings = [versionString 
componentsSeparatedByString:@"."];
        static unsigned long sBCDSystemVersion = 0;
    SInt32 majorVersion = ([versionComponentStrings count] >= 1) ? 
[versionComponentStrings[0] intValue] : 0;
    SInt32 minorVersion = ([versionComponentStrings count] >= 2) ? 
[versionComponentStrings[1] intValue] : 0;
    SInt32 bugFixVersion = ([versionComponentStrings count] >= 3) ? 
[versionComponentStrings[2] intValue] : 0;

Sorry for the noise.

-- 

Bill Cheeseman - b...@cheeseman.name
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