I have reviewed the logs and found the CERs you reported, after review I have decided to escalate this issue up to our AutoCAD development team as a change request. Searching for a workaround for the exception code that was shown in the CER I have as yet not been able to find one. It appears that the development team is aware of the issue and is awaiting a fix from Apple:

Select File dialog in Yosemite crashes AutoCAD for Mac

http://knowledge.autodesk.com/support/autocad-for-mac/troubleshooting/caas/sfdcarticles/sfdcarticles...

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