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What worked for me was going to Tools .. Preferences .. Data Modeler, and then making sure that each of the "Default <x> Directory" specifications pointed to a part of the hard drive that my operating system login user had permission to reach. (I suggest a sub-directory under your login user's "My Documents" or "Documents" folder, or whatever your operating system calls it.) Allowing the initially blank defaults produced weird behavior on my machine. YMMV.