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From your description, it's possible you are seeing the expected behavior as only the following file types are available to generate previews:
doc, ppt, xls, doc,. pptx, xlsx, pdf (Setting Up Document Conversion )
That being said, if you are seeing this message with one of the file type mentioned above I would recommend submitting a case in your secret customer group here in the Jive Community where the next available support engineer can assist with further investigations. When you submit the case if you could also attach a copy of the file you are seeing the error with this should assist them.
Thanks Jesse - back to the drawing board.