Can't access external library after iOS5 update

Question

For years I've kept separate itunes libraries on an external drive without a problem (well, mostly without problems). After updating itunes to work with iOS5 I can no longer access my external library files. All of them are greyed out and I can't choose them. Each collection of library files are located within separate folders ( I have one for music, one for audio books, and one for tv/movies) on the external drive. The data (musice, movies, etc) seem fine.  Has Apple changed where the library files need to be located? or is it another issue. The only thing I could think of was to run repair permissions but that didn't change a thing. I really don't want to lose the organization and playlists for over 100GB of files. Please help!

Answer 1

iPhoto 9.6 only runs on Yosemite.
Option 1
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Repair Database. If that doesn't help, then try again, this time using Rebuild Database.
If that fails:
Option 2
Download iPhoto Library Manager and use its rebuild function. (In early versions of Library Manager it's the File -> Rebuild command. In later versions it's under the Library menu.)
This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places back.
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.  
Regards
TD