[Zubersoft]

Well that doesn't sound good at all. That sounds more like an issue with the PDF library or some kind of error involving running out of memory. Any chance you can export one of the songs that is causing problems so I can try loading it on one of my tablets? Just long press the song, select the overflow at the top right of the library screen and select Export. If you email the file to support@zubersoft.com, I will see what I can learn so we can take care of this issue.

Thanks,
Mike