There is a known issue affecting the Windows version of Auto-Tune EFX+ on some PC systems with older graphics cards that do not have sufficient OpenGL support. The issue causes the GUI screen of Auto-Tune EFX+ to be blank, as shown below:
To resolve this issue you could first try updating your graphics card driver to the latest version. This may resolve the issue and allow you to make use of Auto-Tune EFX+'s enhanced OpenGL graphics performance.
Alternatively, if you do not wish to update your graphics card driver, you can download and install the attached patch, which will modify the Auto-Tune EFX+ preference file to disable the OpenGL setting. To do this, follow the instructions below:
1. Quit your recording software and download the attached patch installer: "Install Auto-Tune EFX+ XML Patch v1.0.0.zip"
2. Extract (unzip) and run the installer. Click through all the screens to perform a standard installation.
3. Once the installation is complete, restart your recording software and load Auto-Tune EFX+. At this point the GUI screen should now be visible.
(Important Note: To avoid this issue in the future, do not enable the "Use OpenGL Graphics" setting in the Preferences menu.)