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If the ProAnimator interface is blank or the controls are flickering, then you probably have an undocked panel. Go to your After Effects Workspace controls (top right corner of the After Effects UI) and save your current screen layout as a New Workspace. Then select the "Effects" workspace to dock all of your panels together.
Now you can open the ProAnimator plug-in and everything will function normally. After working with ProAnimator use the Workspace menu to switch back to your regular workspace.