If MacDraw Pro locks up / freezes when opening / converting files using the XTND translators (MacDraw II, MacWrite II, TIFF, EPSF, etc.), try the following:
1 - Select the Translators icon in Preferences, then click on the Update XTND List button.
2- Quit the application, then delete the XTND Translator List file (System 6: in the Claris folder; System 7: in the Preferences folder).
3 - If the problem persists, rebuild the desktop (hold down the command and option keys while restarting the computer), then run Disk First Aid or Norton Disk Doctor. Disk First Aid is included on your System disks. Instructions are included in your computer's owners manual.