Happened to me today, no files would be seen.
SM launches fine, but no files are linked.
In deeper dive, I see the computer sees my drive ordinarily called “Library” as “Library 1”.
What happened:
A dirty drive unmount of Library somehow caused a FOLDER called “Library” to be created inside /Volumes.
The fix:
In Finder, type shift-cmd-G, type /Volumes
Seek folder w/ drive name and if present, delete it.
You will need to enter password.
Unmount/Remount disk using disk utility.
Voila.
More in this thread:
cheers!
-jeremiah
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jeremiah moore | SOUND | San Francisco
The TANK Center for Sonic Arts | Rangely, Colorado