Seems with the 10.9.3 update Apple is hiding the Users folder. I believe Apple had done this by design, but it also could be a bug. I don't see any harm in it as users couldn't see other users files anyway. The only harm is maybe to people who use the "Shared User" folder. Regardless, I wanted to let you all know.
If you want to change it back here is a fix below.
To ensure the visibility of the /Users folder after restarts, you can create an AppleScript applet, and set it to run when you log in to your Mac. Use the following code:
tell application "Terminal"
do shell script "chflags nohidden /Users" password "yourpassword" with administrator privileges
end tell
Replace “your password” with your user password. Save this as an application, and add it to your login items in System Preferences > Accounts.
