The "Mixer" icons in the "Object Palette" & the "Flowsheet" do not match. It may be good to ensure that both sets match, since I have only used a few of them.
DWSIM V3.6 Build 5823 w/ Mono (Stable 4.2.1.102) ... Ubuntu 12.04.5 64bit
Icons for Mixer and Splitter were replaced.
Icons for Mixer and Splitter were replaced.