Before you start C2isogen, run the configuration setup, click the save button to exit, you can see a file caesar.cfg in your CAESAR II job folder. If you see *_output.xml file, delete it C2isogen will generate a new one. Then try to open C2isogen and see if you can create isometric drawings. This was an old bug, we fix it in new version.
Regards,
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Shawn Zhong
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine