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Thanks, L Key and LMB sounds great :rolleyes:
Yeah, I did not mean the Landscape Grass Material node, but the “Landscape Grass Type”. So right click in the content browser, go to miscellaneous and create a “Landscape Grass Type” and open it and click the + sign. Then the editor crashes 
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Ah that did make a significant difference. I was able to reproduce this and have entered a bug report, UE-19474, to be assessed by the development staff. Good catch!