You don't need to loop through the hash in the second loop. Try this:

for $i (0 .. $#curusers){
    print "$i:userName is $curusers[$i]{userName}\n";
}
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This is one of a few issues I see. Maybe seeing the code for ars_GetListUser() would give us a litte more insite.

Update:Fixed wrong answer. I'm just not thinking.