"Share" button in Preview (10.9.5)
Suggest to reset your Preview app by deleting following files in your ~/Library.

Copy the stuff in brackets in to Finders "Go to Folder" window to find the files.

Caches/com.apple.Preview

Containers/com.apple.Preview 


(~/Library/Containers)

Preferences/com.apple.Preview.LSSharedFileList.plist 


(~/Library/Preferences/com.apple.Preview.LSSharedFileList.plist)

Preferences/com.apple.Preview.SandboxedPersistentURLs.LSSharedFileList.plist 


(~/Library/Preferences/com.apple.Preview.SandboxedPersistentURLs.LSSharedFileList.plist)

Saved Application State/com.apple.Preview.savedState


Launch the application and test.