In PTPublisher, on the final step of the project setup choose "Project Options".
Set the "File System" to UDF 2.50 (Default is UDF 2.60)
For some Blu-ray media types only UDF 2.50 can be used. UDF 2.50 burns at a slightly slower speed regardless of which speed setting is set. Only UDF 2.50 or UDF 2.60 can be used for Blu-ray discs. All other file systems will cause immediate disc rejections.