Strange problem with model editor

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UPD: Nope, it didn't change a thing. Also, I just read that you should be able to directly view the model from the viewer:

At least I'm assuming they mean the .dae file. The thing is though that I can't even open the .dae file with the model viewer.

The model viewer is only useful when you want the materials to be generated automatically. I have heard that the model editor is more stable when it comes to viewing your creations.

Oh, I see. how is collision handled then? Isn't the "shape" used for detection collision areas?
I tried to put the model into the map editor, but it doesn't have texture, it's just a wireframe.

Collision for static objects is based off of the normals (faces) of the object itself. If you just see a wireframe, that means you don't have a material file in the same directory that the model is in that references the textures that the model uses.