Crashes on load since this morning, 4.6

Start loading 2:02:20.

1 Min later 256K

1 min later 2,200K

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0.5 min later crash report

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Unknown exception - code 00000001 (first/second chance not available)

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Runtime\Core\Private\GenericPlatform\GenericPlatformMemory.cpp] [Line: 54]
Ran out of memory allocating 4294967294 bytes with alignment 0