Using C2. Saved files are opening up with parts missing. Another really strange thing, parts of old files, 4 to 6 months old are appearing in the same files. The only commen denominator seems to be that they are modeled boolean objects. I locate the missing files in the bottom drawer (browser tray?) under Master Objects. When dragged onto the working area the objects appear in default gray. But when resaved they fail to open intact. Thanks gang. verngroff