In case of multiple code modules in one page an erorr occurs for the load_helper function in wb_wrapper_edit_are a.php file.
This function is not checked on existence and can therefor throw an error. Result is that the second code block and all subsequent blocks are not shown (in admin of course while this is an admin function) .
Solution:
Replace the loader_help function with:
if (!function_exists('loader_help')) {
function loader_help()
{ ?>
<script>
/*<![CDATA[*/
var url = '<?php print WB_URL; ?>/include/editarea/edit_area_full.js';
try{
script = document.createElement("script");
script.type = "text/javascript";
script.src = url;
script.charset= "UTF-8";
head = document.getElementsByTagName("head")[0];
head[0].appendChild(script);
}catch(e){
document.write("<script src='" + url + "' charset=\"UTF-8\"><"+"/script>");
}
/*]]>*/
</script>
<?php }
}