Regarding keys starting with this:
1. v.1.5.2.350, v.1.5.1.307, and v.1.4.1.248 sometimes find "does not exist" errors there.
2. v.1.5.2.350 is inconsistent in what it finds there. I don't know about the other two.
3. v.1.7.0.399, v.1.7.0.405, and v.1.7.0.407 do not find the errors there.
