All supported documents could be processed using the SilentPrint trial. Now SilentPrint is licensed, certain document types are ignored and are no longer processed.
There are a number of Silentprint versions, each of which process different supported documents. It is likely the wrong version of SilentPrint has been purchased and an upgrade will be required.
For further information about why SilentPrint is not processing certain supported documents, please refer to the All Documents Not Processed article.