Studio Horns and Strings samples are installed but won't play.

I updated to Logic Pro 12. I have Studio Horns and Studio Strings installed but neither will play MIDI files. And every time I open Logic, it tells me those samples are missing and need to be installed again, so I do that but Horns and Strings still won't play. Other sample instruments will play those MIDI files and Drums, Bass and Keys work fine. I deleted and reinstalled Strings and Horns, but they still won't play. I deleted Logic's Pref files, but nothing changed.

Any suggestions?