Hi Scratchy,
it is because the unsopported image aspect ratio. Try to locate the problematic textures and resize them. AssetX will help. It was working for me. (for example- original ratio: 16*2048 ---> modified ratio: 64*512)
good luck
vendel
You only need to modify the 16 number. If original is 16*2048 you must modify it in 64*2048 , 2048 doesnt need to be changed.