this issue might also be caused by over working the CPU by having other programs opened at the same time as loading ue4 or having a lot of browser tabs opened while ue4 is loading. ue4 is masive resource eater if the cpu is mosest or the ram memory is at a minimum. also if the video board is borrowing memory from ram could also cause an out of memory issue. just a simple ideea and might not be your answer
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