I've found an issue that presents a similar symptom to the known issue when creating license files with MS Word. In this case, even creating with WordPad doesn't help. If the license information in the RTF is so short that a scroll bar is not rendered, then it will appear blank (regardless of RTF editor). The easy work around is to insert newlines at the end, but I didn't see any mention of this in any documentation. It took me quite a while to figure it out.