I know what this is, I had the same problem. It's not due to downloading problems, it's the coding, and it's rather easy to solve:
Go into the .material file using notepad (or something similar, just use the search bar), then find the code AMBIENT (usually followed by 0.7 0.7 0.7 on the same line).
Example:
material (mesh material)
{
technique
{
pass
{
ambient 0.7 0.7 0.7
alpha_rejection greater 128
scene_blend blend
texture_unit
{
texture (mesh texture)
}
}
}
}
After the ambient code, copy and paste THIS code:
cull_hardware none
cull_software none
So, it should look like this:
material (image material)
{
technique
{
pass
{
ambient 0.7 0.7 0.7
cull_hardware none
cull_software none
alpha_rejection greater 128
scene_blend blend
texture_unit
{
texture (mesh texture)
}
}
}
}
The code DOESN'T have to look exactly like this- just SIMILAR.
If you need anymore help or questions, just reply. Hope this helped!