Hi Solo,
Reading your post I wanted to find out what was happening regarding the crashes with the material editor, this is behaviour we haven't seen before. I will send you my details, please could you send me further information on what is happening.
Also regarding the render being zoomed out, in the Shaderlight render window we have a Zoom and Pan functionality. You can use the wheel on your mouse to zoom in and out of the render and the left mouse button and drag to pan round the render. This can be done while the image is rendering.
Martin