I don't know if I can answer your main question, but z4root is only for use with 2.2, as well as Universal Androot I believe, so they will probably have weird output if you are on 1.6. Also, I remember seeing some threads on the old boards on the same topic, you might want to search through the archive(either the one on mobileread or one of the other two) and see if you can get an answer there...
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