Models with custom textures not showing up in level editor

[MrDosht]

Hi all, after reading through as many articles as I could find on this subject, mainly yasars and the wiki page on this subject I found that I still had an annoying problem. After what I hope is correctly uv mapping the texture and all that onto a default dungeon wall in blender I then saved this as a blender file and exported it as a collada .dae file, both of these files were saved in the same location as the textures that they have on them. When I try to place them in the level editor however, they do not appear even though I am able to select them and it says that the map has been modified after I place the invisible wall, the object also doesn't appear in the preview part of the level editor that shows you what you have currently selected and the oUtline of the shape appears of the mouse cursor by quite a bit. I understand that I may have just simply overlooked a crucial aspect of something or simply made a crucial mistake. But either way I hope that someone may be able to help me, hopefully