Just launched PrintFriendly version 2.1.5.
Fixed Google Analytics Tracking Plugin problem. Some tracking plugins would break the link used for printfriendly, resulting in sending people to printfriendly.com, not launching the lightbox.
Now you should be able to use any tracking plugin without breaking printfriendly.
Custom Images for Hosted Solutions. WordPress sites using Godaddy, Network Solutions, or other hosts would generate an error when vailidating the custom image. I've removed the validation, so the error wont occur. Just be sure to enter a valid image URL :).