Well, we are running QUIZ version 5.06.C on MPE/iX 5.5 and have noticed no problems whatsoever. Just my $.02 worth. Jim Phillips Manager of Information Systems E-Mail: [log in to unmask] Therm-O-Link, Inc. Phone: (330) 527-2124 P. O. Box 285 Fax: (330) 527-2123 Garrettsville, Ohio 44231