As you can see, when you use non-stock media, it makes the job of quickly reproducing the issue quite a task. Here is the LOG that describes the failed level load:
MISSING MEDIA:
entitybank\\EAI_GCS_WEAPON COLLECTION_MODERN\G22SD SE.fpe=replaceentitybank\\EAI_GCS_WEAPON COLLECTION_MODERN\G22SD SE.fpe
entitybank\\free models\M939truck.fpe=replaceentitybank\\free models\M939truck.fpe
entitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Cedar.fpe=replaceentitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Cedar.fpe
entitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Spruce 01.fpe=replaceentitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Spruce 01.fpe
entitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Pine 02.fpe=replaceentitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Pine 02.fpe
entitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Pine 05.fpe=replaceentitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Pine 05.fpe
entitybank\\Purchased\Henry Ham\Scenery\car_1.fpe=replaceentitybank\\Purchased\Henry Ham\Scenery\car_1.fpe
entitybank\\Purchased\Dagored\Scenery\windsock.fpe=replaceentitybank\\Purchased\Dagored\Scenery\windsock.fpe
entitybank\\Purchased\Dagored\Scenery\windmill.fpe=replaceentitybank\\Purchased\Dagored\Scenery\windmill.fpe
entitybank\\Purchased\BSP\Watchtower 01.fpe=replaceentitybank\\Purchased\BSP\Watchtower 01.fpe
entitybank\\Purchased\BSP\Foliage\Dead Tree 01.fpe=replaceentitybank\\Purchased\BSP\Foliage\Dead Tree 01.fpe
entitybank\\Purchased\BSP\Foliage\Dead Tree 02.fpe=replaceentitybank\\Purchased\BSP\Foliage\Dead Tree 02.fpe
entitybank\\Purchased\Dagored\Critters\deer_female.fpe=replaceentitybank\\Purchased\Dagored\Critters\deer_female.fpe
entitybank\\Purchased\Dagored\Critters\deer.fpe=replaceentitybank\\Purchased\Dagored\Critters\deer.fpe
entitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Birch 01.fpe=replaceentitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Birch 01.fpe
entitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Spruce 05.fpe=replaceentitybank\\Purchased\BSP\Forest Trees\Foliage\Snow-Covered Spruce 05.fpe
entitybank\\user\charactercreator\gechner3.fpe=replaceentitybank\\user\charactercreator\gechner3.fpe
entitybank\\EAI_GCS_WEAPON COLLECTION_MODERN\M700A3 (synthetic).fpe=replaceentitybank\\EAI_GCS_WEAPON COLLECTION_MODERN\M700A3 (synthetic).fpe
entitybank\\Purchased\M Stockton\Junkyard Clutter Pack 2\Boxes\BGWoodCrate1.fpe=replaceentitybank\\Purchased\M Stockton\Junkyard Clutter Pack 2\Boxes\BGWoodCrate1.fpe
entitybank\\Purchased\M Stockton\Junkyard Clutter Pack 2\Misc\RustyGermanHelmet1.fpe=replaceentitybank\\Purchased\M Stockton\Junkyard Clutter Pack 2\Misc\RustyGermanHelmet1.fpe
entitybank\\DK_eigeneWall\armor\Backpack01.fpe=replaceentitybank\\DK_eigeneWall\armor\Backpack01.fpe
entitybank\\free models\Winter.fpe=replaceentitybank\\free models\Winter.fpe
entitybank\\free models\wheel a.fpe=replaceentitybank\\free models\wheel a.fpe
entitybank\\free models\crownvic.fpe=replaceentitybank\\free models\crownvic.fpe
entitybank\\DK_eigeneWall\MSMedKit-modified\MSMedKit1.fpe=replaceentitybank\\DK_eigeneWall\MSMedKit-modified\MSMedKit1.fpe
entitybank\\NEUE WAFFEN\entitybank\Model Pack 9\Handguns\G22 Ammo (x01).fpe=replaceentitybank\\NEUE WAFFEN\entitybank\Model Pack 9\Handguns\G22 Ammo (x01).fpe
entitybank\\Purchased\team_wolf\Fixtures\round_ceiling_light.fpe=replaceentitybank\\Purchased\team_wolf\Fixtures\round_ceiling_light.fpe
entitybank\\DK_eigeneWall\llll\DNSI\Street Light GraPhiX.fpe=replaceentitybank\\DK_eigeneWall\llll\DNSI\Street Light GraPhiX.fpe
entitybank\\Death Valley\Bridge\bridge_5.fpe=replaceentitybank\\Death Valley\Bridge\bridge_5.fpe
Creating a new level with stock media solves this and allows me to quickly reproduce (and fix) the issue.
PC SPECS: Windows 8.1 Pro 64-bit, Intel Core i7-5930K (PASSMARK:13645), NVIDIA Geforce GTX 980 GPU (PASSMARK:9762) , 32GB RAM