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Hmmm... We might need more info. Is there something that you do which induces the crash, or is it somewhat random? Sometimes if you are vertex editing and you accidentally overlap two vertices in the same X, Y, Z coordinates, UEd WILL crash (does not matter what version). Other crashes could be related to the type of display you are using (so try changing the UEd display from D3D to software rendering - this will also improve performance in some cases). These are my suggestions for now, until I have more information to work with.