Your correct that the add to OptionTree option when clicked does not upload the images. Interestingly, the theme, Energize, seems to be the problem. When deactivating the theme and activating the TwentyEleven default theme, OptionTree showed up on my dashboard and was able to upload images when the add to OptionTree button was clicked. When reinstalling the Energize theme, the OptionTree plug in disappeared from the dashboard and when trying to upload a header image in the theme options section, the add to OptionTree button did not work. I’ve contacted the theme developer for assistance.
