When you say "freezing", how long did you leave it? A couple of my scenes take several minutes to save just because of the object structure - and that's on a 1Gb box with 7.2Krpm HD. Loads of non-connecting polygons within single objects seems to be the culprit, grass and plants being the worst. If you've waited more than 10 minutes, however, then it's probably something else. Just to give you an idea, my piece "Ox the Hunter" takes almost 5 minutes to save, and that's just cos of the arrangement and number of polygons on the grass. Initially I created a large patch of grass with about 10,000 individual blades, but after waiting for about 30 minutes I gave up trying to save it! This doesn't apply to polygons within terrains, because I've had 60,000,000 poly's before now saving in 20 seconds or less. Anyway, this might be the problem. Or it might not! :-)