If you have AutoCAD for Mac 2014 or older or AutoCAD LT for Mac 2014 or older, do not update to Mac OS X Yosemite (version 10.10) when it becomes available on October 16, 2014 as they will not run reliably until updates for them are available.
To confirm your version of OS X, click the option 'About This Mac' from the Apple icon at the top left of the desktop. If you see a lower version than 10.10, then your AutoCAD for Mac or AutoCAD LT for Mac will run OK.
AutoCAD for Mac 2014 and AutoCAD LT 2014 for Mac support the new Apple Mac OSX Mavericks OS which is the release after Mountain Lion. This update resolves critical issues for AutoCAD 2014 and AutoCAD LT 2014 on the Mac OS X Mavericks, and improves the stability.
According to Autodesk's KB Article, AutoCAD for Mac 2015 is compatible with Mac OSX Yosemite (10.10). AutoCAD for Mac versions 2014 and earlier currently are not compatible with Mac OSX Yosemite (10.10). These versions may launch, but will not operate properly and damage to your project data could occur.
We strongly encourage you to carefully check operating system compatibility with your version of AutoCAD for Mac before upgrading your Mac to OSX 10.10 (Yosemite).
Autodesk plans to release service packs for AutoCAD for Mac 2013 and AutoCAD for Mac 2014 within several weeks after the Yosemite release that will allow those versions to run on OSX 10.10 (Yosemite). When a service pack is released for your version, you'll receive notice in the Mac OS Notification Center. Available service packs are also posted on the AutoCAD for Mac support pages here:
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Update:
AutoCAD 2014 for Mac Service Pack 3 was released Nov 11 2014 that corrects these problems that were previously encountered when running AutoCAD for Mac 2014 in Yosemite 10.10.
From the Readme file:
As a result of detailed information from customers who used the Customer Error Reporting (CER) utility, a number of problems were identified and fixed. Updates have been made to the following features:
CUI
- Crash when reset defaults in Customize dialog.
Dimension
Bash cheat sheet mac. Basic housekeeping includes regular back-ups plus some other, less familiar, tasks. Maintaining your MacBook keeps it running fast and smooth. Mac OS X Maintenance ChecklistMaintenance is vital if you want to keep Mac OS X Lion in tip-top condition for as long as possible. Use Finder keyboard shortcuts to display windows, copy and move files, and launch applications. These keyboard shortcuts help you get things done more efficiently.
- Crash when select a dimension if the dimension text has filled color.
Light
- Crash when select light objects.
Open/Save
- Several issues that may cause crash when save a drawing.
- Random crash when quit AutoCAD.
- Crash when replace missing shx fonts when open a drawing.
- Crash when trying to open the recovered files from last crash quit.
Other
- Random crash when load thumbnail in various UI dialogs or palettes.
- Crash when right click, when CUI is not successfully loaded.
- Crash when right click commandline window.
- Crash when using localization keyboards.
Plot
- Several issues that may cause plot crash.
Startup
- WHIP crash when initiate drawing window.
Viewport
- Crash when delete a named viewport.