Normally I’m working in each project with a project specific picture library. In the past I closed FM and iPhoto, opened necessary iPhoto library and started FM again.
Now after upgrade to FM 4.5.1 I can work with a lib named exactly “iPhoto Library” only. Pictures of all others like “iPhoto Library marriage” are not longer shown in the sidebar and can only be used by drag & drop.
No problem here with 4.5.3 and Mavericks. It’s a pain that I have to restart iPhoto to switch libraries, but it does work.