Thanks, a few folders got jumbled and files were accidentally duplicated (or got corrupted) that's why it didn't work.

When I start Sketchup, I do this: View > Edge Style > uncheck Profile
Because the lines surrounding a figure/entity is thick but when I close Sketchup, it's back again. How do I make it permanent?

It wasn't like that before if I didn't made a big mess with Sketchup.
Also, the color became yellow, normally it's bluish.

I'm using WinXP 32bit and an old Sketchup 8.0.11752 free ver.

I get this error:

I did this:
Windows > Preferences > Extensions > Install Extension...
I selected OBJexporter_v3.0.rbz then restarted Sketchup 8.0.11752 (free version) and I got that error.

Oh, so it's called Natural Shading.

Thanks a lot for the help!!

Is there a way to disable (what I call) the "Natural Shadows"??
It's when you create a basic cube and rotate the view, sides of the cube are turning in to shades of gray.

Is there a way to remove them?

Thanks.
PS: not about turning on the Hidden Line because I want to work with textures but I don't want to see those natural shadows.