Slideshow Music doesn't play in iPhoto 9.5 and Mavericks 10.9

After ugrading to Mavericks 10.9 and then to iPhoto 9.5, music from playlists in my iTunes 11.1.2 Library doesn't play in iPhoto slideshows. Music shows up in the iPhoto Slideshow Music menu OK, but won't play there or in slideshows themselves. Both worked fine in OSX 10.8.5 and iPhoto 9.4.3.

Oddly enough, the built-in Sample Music and Theme Music from the iPhoto Slideshow menu DO work!

Anyone else having this problem? Any fixes. Am holding off upgrading my other computers, since I do a lot with slideshows, and this is a big problem for me.