This message is popping up more frequently and has become a serious problem. Part and assembly files cannot be opened. Work has been lost. It was thought that files were being corrupted over the network and so myself and colleagues began working on files locally. This didn't solve the problem. Best guess is that the corruption occurs after after a solidworks crash but not necessarily immediately afterwards. Has anyone else had this problem? What causes it? Can corrupted files be recovered? How can I avoid it? I really need help on this one. Recognition that this problem exists would at least help ease the pain! Simon