ok. The "Initial phase failure: Price not found!"-failure I got. There are no SPAN-Tags nor classNames "productSpecialPrice", "normalprice" or "productPriceDiscount".

But why? The tpl_product_info_display.php has this in:
Code:
<!--bof Product Price block -->
<h2 id="productPrices" class="productGeneral">
<?php
// base price
  if ($show_onetime_charges_description == 'true') {
    $one_time = '<span >' . TEXT_ONETIME_CHARGE_SYMBOL . TEXT_ONETIME_CHARGE_DESCRIPTION . '</span><br />';
  } else {
    $one_time = '';
  }
  echo $one_time . ((zen_has_product_attributes_values((int)$_GET['products_id']) and $flag_show_product_info_starting_at == 1) ? TEXT_BASE_PRICE : '') . zen_get_products_display_price((int)$_GET['products_id']);
?></h2>
<!--eof Product Price block -->
Any ideas?