Ultimate Branding - Login Image not working

I installed latest Ultimate Branding plugin with Wordpress 3.5 but Login Image is not working in it.

I uploaded an image with dimensions (310 x 70) and image size 70 kb. But the image is still not showing on the login page.

The image is correctly uploaded to the folder /wp-content/uploads/ultimate-branding/includes/images by Ultimate Branding.

Please tell me what to do to correct this.