IIRC the latest aircraft packages offer some tracer textures which as MajorMagee says are in a different .dds format. This creates a mismatatch between the blendmode in the tracer effect called for in the effects file, and the blendmode in the dds testures in the fxtextures folder, if care is not taken to keep things consistent.
So maybe that's the source of our new textures. Alternatively there were optional textures provided in the recent effects package!