render scene problem

there are some differerces between in debug mode and in release mode.
in debug mode, terrain is bright,but in release mode,terrain is dark.
Does anyone encounter this kind of problem??

[url=http://p13.freep.cn/p.aspx?u=v20_p13_p_]http://p13.freep.cn/p.aspx?u=v20_p13_p_[/url] ... 5973_0.jpg


[url=http://p12.freep.cn/p.aspx?u=v20_p12_p_]http://p12.freep.cn/p.aspx?u=v20_p12_p_[/url] ... 8426_0.jpg

If there's a difference between debug and release mode then perhaps there are some uninitialized variables somewhere.

Terrain shading looks strange in your debug screenshot as well. Does this happen for other regular meshes or only for terrain?