Arduino 1.8.2 Zero Bootloader Problem

Hi, I want to report a problem with SAMD Boards 1.6.14:

I'm using a M0 Pro, I burned the bootloader, then proceed to test with Fading example.... well, pin 13, 7 and 6 are not working with PWM, the others work as should.

¿Is this my fault or some bug on the software?.

(It's a fresh install of arduino ide). Thanks for your help!.