, I may be seeing a related crash: I noticed that in both cases there’s reference in the call stack to a directory on a “D:” drive, which isn’t a physical drive that exists on my machine and the engine trying to access it seems to be giving the error.
Assertion failed: IsValid() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.3\Engine\Source\Runtime\Core\Public\Templates\SharedPointer.h] [Line: 658]