First of all: as always your work is appreciated.
Then some remarks... I installed XML::Simple from CPAN and can't connect to perlmonks.org because I'm living behind a very strict firewall. Then you'll find that the error message should be rearranged:
from:

die "Error logging in: $result->code() $result->message()"
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to

die "Error logging in:\nCode:", $result->code(), "Reason: ",  $result-
+>message(), "\n"
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Now I'll give it -say- 5 minutes to find out how to get through the FW using a proxy... hang on :)

Update1: Somehow the env_proxy() method (as described in man lwpcook doesn't work, so I use this (add after the cookie-jar line)

if (defined $ENV{'http_proxy'}) {
  print "Using HTTP Proxy: $ENV{'http_proxy'}\n";
  $agent->proxy(http => $ENV{'http_proxy'});
}
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Now I'll take a short look what goes wrong with nodes having a negative reputation (yes, I got one of those, you should have one, too: just for testing purposes *grin*)

Update2 Just replace the %3u in the printf statements at the end of the script by %3d so we can display negative numbers...

Update3: Sorry, a '\' has sneak into the first fix: right before the 'R' of 'Reason'. Removed it...

Regards...	Stefan
you begin bashing the string with a +42 regexp of confusion