diff -r 39330e3f52c2 -r 1afd96cc2be6 src/newgrf_gui.cpp
--- a/src/newgrf_gui.cpp	Thu Jul 24 16:23:55 2008 +0000
+++ b/src/newgrf_gui.cpp	Thu Jul 24 18:29:01 2008 +0000
@@ -593,6 +593,7 @@
 			}
 		}
 
+		this->sel = NULL;
 		this->SetupNewGRFWindow();
 		this->SetDirty();
 	}