Mirror Reflection + Water Reflection. RenderToTexture problems

When there is an object in the scene with reflections-mirror2 and water(Pro) with reflections, the first all right, but when I exit the program and reopen the scene reflections no longer work even if the names of the textures in the script are different:

Code (csharp):

1. m_ReflectionTexture.name = "__MirrorReflection" + GetInstanceID ();
2. k_ReflectionTexture.name = "__WaterReflection" + GetInstanceID ();

How can I fix it?

This is the video that shows the problem : http://www.kreative3d.it/Download/Reflections_Problems.php