Calling a function like system flattens the arguments, so the contents will not be in $ARGV[4], but in @ARGV[4..$#ARGV]. So you can try this instead: 
$agent->field("PATHS", join("\n", @ARGV[4..$#ARGV]));

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In reply to Re: Filling a textbox with an array in WWW::Mechanize by moritz
in thread Filling a textbox with an array in WWW::Mechanize by Anonymous Monk

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