RenderTexture Create Problem

Hi! to ALL
i a making one Cube Face Application
i put 7 camera in this project. All camera are target at the each face of Cube. (mins front camera is watching only front face of cube ).
and 7th camera is perspective view. now i m put Render Texture in All first 6 cameras. and assign that texture in six different material. when i applied that material in inside the plane my click effect on 3D objects are not working.(Visible_Camera is Button Not Working) after Deactivate all 6 camera it is working. Strange!!!..

i send package with this any one can solved this??? pls help me.

link text

Hi Warwick Allison

you can download my package form link this link. to understand my problem.
http://forum.unity3d.com/threads/99473-RenderTexture-Create-Problem