Hi – I recently upgraded to OS Sierra (10.12.3) and HelveticaNeu.dfont and the DeskInterfac.ttc fonts are required for system fonts loaded on my computer. I also have, and prefer, to use Helvetica Neue Open Type font. I also have Helvetica Neue True Type. Anyway, when I active the Open Type style, I get a conflict message. Could this be the system dftont or is it the True Type? In any event, I blindly ignore the message and it hasn’t been an issue (fingers crossed), but it is bothersome and I’m wondering if I should remove the TT wherever it might be.