Thanks guys...I've actually had to start over....I've started saving in steps renaming..as in scene1,2.3. I think the grouping thing could be the problem as I'm trying to create a forest on a mountain.....it's the conifers LOL MP - that would have worked but I was NOT saving in increments..lesson learned.... Timefighter - that last save that did not corrupt was 660,448KB. TF - patience was not a thing...The save bar stopped dead & box appeared that said click OK....but no message or alert appeared. When I clicked OK all went dead. Oh well...starting over & trying to be happy LMAO ;)..Not really LMAO...just arrghhhhhhhh