Thank you very much! Just trying to get my head around it and seeing what the differences are on a mac. Strangely enough though, I was going through the tutorial and thought "I might as well see if it has suddenly cured itself". And just to annoy me, it has started to work! :headbang: Although it is still a bit hit and miss, so I think I shall try and figure out that method of rendering through the command line. Thanks once again.