UE4.7.5 & 4.7.6 - Nodes disappear in material editor.
I have spent a long time making a landscape and have just got to the point where I apply the material. A couple of days ago (4.7.5), in the material editor, I was trying to pick up a wire from a link and it wouldn’t pick up. It took about 5 attempts to get the wire. When I tried connecting it to another node, EVERY node in the material ‘folded up’. I unfolded the texcoord node with the little white arrow but the link connector had disappeared completely (see pic). I turned off the editor and shut down the pc thinking it was a minor bug. Today (4.7.6) I opened up the material again to find all the nodes still folded and with missing link connections. I can’t connect anything together.
Has anybody else experienced this and if so is there a fix available, because I don’t want to lose all my work?
Thanks in advance x.