> On Dec 11, 2015, at 10:23 AM, Michael McLaughlin <[email protected]> wrote:
> 
>          v2.resize(length);
>          for (c = 0;c <= length;c++)
>             v2[c].resize(length2);

You have an off-by-one bug and are writing past the end of the v2 vector. (The 
“<=“ should be “<“.) For random reasons depending on how the heap happens to be 
laid out at the moment, this will sometimes be benign and sometimes cause 
terrible problems.

PSA: Turning on the Address Sanitizer in Xcode 7 (it’s in the Run and Test 
sections of the scheme editor) would probably have caught this at the moment it 
occurred.

—Jens

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