SetFirstDayOfWeek ASSERTs

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   When I try to use the SetFirstDayOfWeek it asserts on me - it does this in the sample provided as well (Calendar Demo). I've got v12.0.1. The assert is here:

AFX_INLINE int CXTPCalendarUtils::GetDayOfWeekIndex(int nDayOfWeekMask) {
    for (int i = 1; i <= 7; i++)
    {
        int nTestMask = 1 << (i-1);
        if (nTestMask == nDayOfWeekMask){
            return i;
        }
    }
    ASSERT(FALSE);
    return 0;
}

Do you know what could be wrong?

Thanks,

   Dennis