Installing the new version of Matworx 13 on a Windows 7 machine stopped the ListUp Function in Matworks by greying it out and making it unclickable
Reverting back to Matworx 10 fixed this which can be downloaded here https://mega.co.nz/#!aVYXQBpA!vFEOBxOhUuvzJIVDYoUNWvrAMHMU1ZeodhrULqNxgAo