Plex Media Center has 10 foot interface and can be fully controlled with a remote. However, with some setups, on-screen virtual keyboard may not respond to arrow key presses on a remote making it impossible to enter any text without a keyboard.

Solution which worked for me was:

• Open file C:\Users\<user name>\AppData\Local\Plex\userdata\guisettings.xml
• Find following lines:
  <input>
          <enablemouse>false</enablemouse>
          <remoteaskeyboard>false</remoteaskeyboard>
  </input>
• Replace above with:
  <input>
          <enablemouse>false</enablemouse>
          <remoteaskeyboard>true</remoteaskeyboard>
  </input>

Plex Media Center for Windows 0.9.504