Lost the material channels

I clicked fast on a material today and all of the unused channels from the left, pop disappeared in front of me.If i create a new material i get no channels on the left at all to plug things in to.

I also deleted the UDKEngine and recompiled to create a new one just in case, but nothing.

My bad.There was a show/hide unused connectors button (which i never used before). Since the monitor is set to 4k and udk editor doesn’t scale correctly, it was difficult to notice the small icon.