Also check that the extension has created the following images in your google_javascript/images folder. If not there, re-enter the Google app and re-create them:
traditionalpillow_deepjungle.gif
traditionalpillow_deepjungle.png
traditionalpillow_deepjungle_mozprint.png
traditionalpillow_deepjungle_transparent.png
traditionalpillow_shadow.gif
traditionalpillow_shadow.png