I have used the below which is somewhat similar to what you mentioned

my $inputobject=$mech->current_form()->find_input( undef,'submit' );
print $inputobject->value . "\n";
$mech->click_button(input => $inputobject);
print $mech->status() . "\n";
[download]

The $inputobject shows the correct button element as in the HTML source and the second print returns a status of 200 which apparently stands for OK. All of this still doesn't work, can't even see any errors anywhere. I attempted including LWP::Debug qw(+); in the code, but its not returning me any logging info either