When we started looking into TR 9.1 last year, we also ran into issues with PDF's not working with our Optio software (characters missing or getting garbled). I created a case with the support line for Optio and was told that I'd need to upgrade to the Transform product, and would likely need to tweak our existing documents. That was the straw that broke the camel's back for us, and we decided to migrate all of our document processing to using the embedded BI Publisher instead. We took a 3-day class with a consultant on-site, and then a few months to re-do our 15 or so documents, but now we're off of Optio and using the embedded BI Publisher (which we're already paying for as part of the Red Stack).