should it?
Even if it was not supposed to be like that, theres no harm to do so.
The first texture folder FSX was looking was the main one.
The second was the one in the Addon Scenery folder.
The third are the multiple sceneries added whit there own texture.
Libraries textures came at the end refered by sceneries bgl's.
Theres also the fact than EZ & RWY 12 libraries had been made for FS9 at first, & the coding of FSX differ a bit from the FS9 one.
I dont know for you, but for me, i got alot of suff already installed in my sim before installing the MM scenery. Obviously (in my case at least) its look than its conflicting somewhere for some objects.
Another good example was the ramp light pole at Mistys place, originally this are Eaglesoft objects whit old ASM coding who had been converted & reworks in severals library formats. As i got all format, in this case i had to rename the texture ESDG_ramp.bmp to ESDG_ESDG_ramp.bmp (original texture name) & put i t in the main texture folder to make-it show.
When you know, it just became little inconvenient (sure you had to know), but basicly the MM sceneries are well composed & not too hard on FPS.
Regars
André