PD4ML encoding issue (works on mac, not on linux)

Hi,
I am using the command line to convert HTML to PDF on my macbook.
I have a mirrored setup on an Ubuntu server, also Java installed.
Conversions are okay, but some characters are not encoded and result in ??.

The file mimetype both on the server and my local dev is: UTF-8 (file –mime-encoding merged_booklet.xhtml)

A part of the file:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=420,height=420" />
<title>Jouw_schoonheid_[NETQ_demo_versie_23]-1</title>
<link href="http://project-beauty.local/wp-content/uploads/booklet/src/nl/pdf/0.1.16/src/OEBPS/css/idGeneratedStyles.css" rel="stylesheet" type="text/css" />
</head>
<body id="Jouw_schoonheid_-NETQ_demo_versie_23--1" lang="en-US" xml:lang="en-US" style="width:420px;height:420px"><div class="page">
<div class="page">
<div id="_idContainer009" class="Basistekstkader">
<div style="width:340.15px;height:340.15px;position:absolute;top:0.05px;left:0px;">
<p class="Pag-4--colofon-top ParaOverride-1"><span id="_idTextSpan026" class="CharOverride-5" style="position:absolute;top:4.29px;left:0px;">© </span>

The © character in the last span for example does not get converted properly on my ubuntu box. On the mac, the PDF looks fine.

Where should I start to look, because I know ubuntu supports utf-8, so I try to force pd4ml.jar to run in utf-8 mode?

Hope you can help me out.
Very happy with PD4ml, works like a charm.