Tiffen Dfx version 3 has been optimized to work in the Yosemite operating system, you will need install the latest build.

1) IMPORTANT** Uninstall all previous versions of Tiffen Dfx version 3 BEFORE YOU INSTALL THE NEW BUILD

- In the Finder, press and hold Alt > Go > Library
- Navigate to Library/Application Support
- Delete the Tiffen folder

 2) Install the latest build of Tiffen Dfx from here:

http://www.tiffensoftware.com/products/dfxv3-free-trial-download/dfx-v3-free-trial-downloads

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If you are experiencing an error of 2110, please refer to this KB article:

http://tiffen.helpserve.com/Knowledgebase/Article/View/268/0/error-2110-on-the-mac