If you worked with earlier versions of the API, you are probably aware that there was issue in footnote number conversion. A Word document with such footnotes was converted to PDF or any other supported file format successfully but the footnote number order was disturbed.
There was one more issue reported in the forum. It was about converting a PowerPoint document with black SmartArt text to PDF. And the SmartArt text in the resultant document was changed to white text....docx (with table of content) to ...