I can recommend you the following:
1. Install the latest service release of Arbortext IsoDraw 7.3 M031.
2. Report about your issue to PTC's technical support ("Create a New Support Case"): https://support.ptc.com/apps/case_logger_viewer/auth/ssl/log
I can recommend you the following:
1. Install the latest service release of Arbortext IsoDraw 7.3 M031.
2. Report about your issue to PTC's technical support ("Create a New Support Case"): https://support.ptc.com/apps/case_logger_viewer/auth/ssl/log