Responder was updated to version 1.0.1 to fix an issue Inter*Poll had identifying the Macintosh IIx. (The Installer for System Software 6.0.3 automatically installs Responder 1.0.1.) When you use this version with the older Inter*Poll 1.0, the problem appears. The fix is to use Inter*Poll 1.0.1 with Responder 1.0.1. Also note that this is not the current version of Responder. Version 2.0.x is available as of this review.