I tried as you said islandmon, and while opening VW was fine the thing went mad when i went to open up my big file. I have now delated all symbols from it and its still 67mb. Plus i have noticed after adjusting what classes are visable VW says it needs to re render the scene, even though the scene was rendered beforehand. When i skip this and the image sorts itself out (class wise) the scale jumps to 1:1, even though when I started out the drawing was done in 1:50. Any ideas? Thanks?