Texture Position

[jpb17]

Why does extruding a surface re-orient the position of a texture?
I've texture mapped bricks (each one) in an arch with an existing brick texture I want to match. Once I place the arch where I want it within the model I extrude the bricks to match the depth of an adjoining surface. What happens next is the extruded the texture is re-oriented to the position it was when originally imported before it was painstakingly oriented.
Thx.

[jpb17]

I forgot to mention I hid the lines between each adjoining surface. Once I unhid the adjoining line the surfaces extruded properly, without re-orientation.