Which version of Netblog and Wordpress do you use? Do you use a custom editor or possibly a plugin which heavily changes the way Wordpress works internally?

Can you describe exactly what happens when you want to create, save and/or publish a post, please?

The tag "<!--{NETBLOG_EXPORT} [encoded embedded export data] -->" is used internally to ensure export and import capability. The tag "<!netblog reference comment !>", or any tag starting with "<!netblog" cannot be directly generated by Netblog 1.5.2 under known circumstances, since it does not make much sense to use such a tag - "<!-- -->" is a HTML comment tag and thus not directly visible to your Website visitor. To ensure maximum security and privacy, Netblog filters the content of your posts before they are send to your visitor so that this EED (embedded export data) is not transmitted over the Internet for a Website access. This tag was made because Wordpress lacks a filter for filtering a post's content just before exporting it.

Many thanks for your report.