posted 03-26-2002 08:22 AM
[1]Your wad is prolly corrupted, or you did something with the 2d sprites... Not quite sure..[2]I had this problem also with a older level, too many objects in your wad which drains memory can create these transparent textures.
The mixed textures are caused when you edit your wad too much with trwest, they get mixed up... I fixed my problem cause i had a backup wad which i always make when editing them
[3]Some objects need eachother to function correctly, its expirmenting with this, mostly the Six_Shooter item depends on alot of objects, Uzi_anim, Flare_anim, Bird_blade and Doortpe4 ( from cleopal ) need SixShooter anim and also puzzle hole_4 it was or something, anyway you should expirment, i got my custom wad perfectly using coastel.wad, i was able to delete all puzzle holes and key holes and door types which pleased me alot 
[4] already questioned from other people
[5]Depends on how meshes a object has, a dog has more meshes then a rolling ball, also depends on the surface of the object, like the more wired surfaces it has the more textures it will drain. As soon as you bump into memory limit your wad will be corrupted or it will act weird and textures might mix...
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The best thing and last thing is to try ( ^_^ )=b