I have been using DS4.5 on Mountain Lion for a few weeks, but this morning my content library is empty. The Smart Content tab is finding all my smart content, but my Content Library tab is finding nothing. Any idea what may be the cause [or better yet, the solution] I closed and reopened the program and the problem is still there.
 Fixed it! I changed the workspace to a different one and then back again, and the content library reset to show the folders and content and search now works…odd.