CS4 BluRay Subtitle Issue during Build

I am currently running Encore CS4 version 4.0.0.258 and I am having the following issue.



I'm trying to build a BluRay disk that is full of video menus, language tracks, and subtitle tracks. I have managed to get everything working and have created a dvd trial copy with all the required components and all works well. When I try to build the same project as a BluRay I get the following error: Error with Directory "ProjectName.prproj_subtitle_1." What I am not understanding is why the error is linked to Premiere when the subtitles were imported as a text file through Encore and all the assets are independent video files. I have not used any Dynamic Links, so there should be nothing pointing to Premiere.



I have read that there seem to have been issues with creating subtitle tracks on BluRay with CS3, but I can't find any information on CS4. Does anyone know if this is an Adobe issue? Any suggestions to get this working would be greatly appreciated.