In addition, I ran strace with xmgrace, and got the following message: Process 3996, exception 40000005 at 7C81EB33 and an error in a box 16 bit MS-DOS Subsystem: /usr/share/grace/bin The NTVDM CPU has encountered an illegal instruction CS:0674 IP:01c7 OP:fe95 b8 ff ff My computer is a 3 GHz P4 This may be useful, Charles -- Dr. Charles L. Werner Gamma Remote Sensing AG Worbstr. 225 CH-3073 Gümligen, Switzerland Tel: +41 31 951 70 05 FAX: +41 31 951 70 08 http://www.gamma-rs.ch -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/