Ok, it appears the culprit was found. There was a missing DLL file which was installed by the ICR which the Footprints program also used. Adding the DLL file to the main CAB allows it to launch without any certificate errors on a Stock Sprint Touch PRO.
Also, there is a fix which now centers the photo correctly which is now added to the CAB I posted (thanks to SztupY).
You can grab the updated
CAB here for now until KDKobes puts it on the front page.
Just waiting for XboxMod to finish the TF3D tab/menu plugin so that it's properly integrated.