The user library is by default hidden in Lion, Mountain Lion, and Mavericks. Try these steps to navigate to it
1.Go to the Finder
2. Press and hold Option key
3. Click "Go" on the menu bar
4. Choose Library
Go to user/library/preferences and remove the com.gvox.encore5.plist file.
Please follow the attached movie to trash the Encore preferences file.
Please Shut down the computer after completing the removal of files.
Leave the computer off for at least twenty seconds before restarting.
Please attempt to launch the Encore software.
If you still experience problems let us know what happens and we will try to find a different solution.