Your project log reveals a slew of warnings that on their own might not be an issue but compounded by creating multiple instances may cause a crash.
Here are the possible causes that, even if not causing the crash, should be fixed in any event:
Problem:
“uasset… has been saved with empty engine version. The asset will be loaded but may be incompatible”
Solution:
Delete Intermediate and Saved folders
Problem:
“PersistentLevel ModularMeshes Externally referenced”
Solution:
Re-name project folder as described here:
Right-Click Content folder in the Content Browser and select “fix up redirectors in folder”
Problem:
“Warning: Initialising Body : Scale3D is (nearly) zero: Component: VanishingCubes10.Cube Cube”
Solution:
Troubleshooting step: Delete all assets (ie. all “Vanishing Cubes”) with this warning to ensure this is not what is causing the crash.
Be sure to run a map check on all levels to remove issues like these from the list of “suspects” that may be causing the issue. After performing these steps, if you are still experiencing a crash, make sure you are hitting submit on the Crash Reporter window and physically cut and paste the callstack (contents of the window) into a text doc and post here. (hint: text should include your machine ID.)