I was building a graph with about 20+ nodes in it. I was having some trouble with nodes updating so I closed Gaea and reopened the file and all previously created nodes were gone and just the mountain and erosion node were present... Not sure what or how this happened. I had been working on it for a little while and had previously saved and reopened the file with no issues. Also strange is when I go to open up an autosaved file from earlier it flashes the nodes that should be there then quickly only loads the two default nodes.