I am also having problems adding audio (from itunes) to a slideshow - selecting a track from itunes causes Lightroom to shutdown. I get a black exclamation mark in the playback window with no information as to what the problem might be. Any ideas...?
I have same issue with Creative Cloud version of Lightroom 5 . I am using Windows 10.
I have seen several other threads with dates as far back as dec 2014. and no response from Adobe. Since this is a feature I was using in PSE, I guess I won't be converting.