Hi, in my case, with default url pattern modified, i have to disable the Google API module (isn't the same that the Google Analytics Module). Once i disabled the GAPI, i can see the most viewed data in the dashboard (but with errors, when i have a little of time free (never) i take a look to the code).
For remove the ID from the url, i use the free module provided by HA!*!*Y http://www.prestashop.com/forums/topic/204935-override-friendly-urls-without-id-number-for-v15/?hl=%20pretty%20%20url But i don't recommend to do this, you can have issues with other modules that you have to solve by hand. (it's dificcult for me to explain this in english)
Spanish reason:
Hay módulos que no están programados correctamente, y aunque el modulo que elimina las urls funciona correctamente, puede generar malfuncionamiento en módulos que no están correctamente programados. (eso no quiere decir que los módulos sean malos, simplemente que son incompatibles).
Si pudiera volver atrás, no instalaría este modulo para ahorrar conflictos.