UPDATE: The verify-option of the EGL has solved my problem. 
Hello fellas!
I might need some help with my Editor, since I dont know how to handle this.
Everytime I start it, this crash message comes up:
**Assertion failed: !HasAnyFlags(RF_NeedLoad | RF_NeedPostLoad) || Existing.Linker->ExportMap[Existing.LinkerIndex].bForcedExport [File:H:\SVN_Ark\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectLinker.cpp] [Line: 97]
Detaching from existing linker for …/…/…/Projects/ShooterGame/Content/Maps/TestMapArea.umap while object CapsuleComponent /Game/Maps/TestMapArea.TestMapArea:PersistentLevel.MiniRex_BP_C_0.CollisionCylinder needs loaded
VERSION: 0.0
KERNELBASE.dll!UnknownFunction (0x00007ffb79663c58) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007ffb42c08b5d) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007ffb42aedc48) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007ffb42ac1f52) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007ffb529b9539) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007ffb52886d2a) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007ffb528c65bb) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007ffb529b01cf) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e6ec822) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e6d356d) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e6bac03) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e99247d) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e6e469a) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e6e437b) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e9f9613) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ffb3e98dde0) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6e8dff80d) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6e8dff93a) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6e8e0c0e0) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6e8e0d009) + 0 bytes [UnknownFile:0]
KERNEL32.DLL!UnknownFunction (0x00007ffb7c418364) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007ffb7c867091) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007ffb7c867091) + 0 bytes [UnknownFile:0]**
Help would be greatly appreciated.
Many thanks in advance!