This is fixed in the MacDraw II XTND translator (1.0v4) that ships with MacDraw Pro 1.5
Saving As a MacDraw II file from a Quadra with the 040 cache enabled will result in a system error. This system error happens when saving from both Claris CAD 2.0 and MacDraw Pro 1.0
The workaround is to turn off the 040 cache before saving as a MacDraw II file, or upgrade to the MacDraw II XTND translator 1.0v4.