Hi, This question is regarding WinProp WallMan software. I found in my WallMan window that, all options in preprocessing tab are greyed out (disabled). Also, the preprocessing icons on the right side of WallMan window are greyed out too. Can anyone help me to find a way to activate Preprocessing properties. I am in need to run 3D IRT for my simulation which I cannot do without preprocessing data.  I highly appreciate your help.   Thanks Balaji