I'm forever ending up with no transmap applied. It happens if, last time you had the materials dialogue open, you had "Changes apply to whole figure" checked and then you open it again with your transmapped object selected in the main window, and it has no transmap applied to the first material (which is often the case for "Preview" for example). If I notice I cancel, select a solid object, reopen and untick the whole figure box before picking the hair (or whatever) from the dropdown list at top left. Richard