I believe platform.bible is still considered pre-release software so I doubt if PTXPrint will detect projects in its project folder. You might be able to get PTXPrint to load a project if you manually copy it to the Paratext 9 project folder (usually c:\My Paratext 9 Projects), but that would be a cumbersome task. My understanding is the beta release of Platform.Bible will be in springtime (April, May or June).