I can confirm that I see the same behavior on an Edison board that I upgraded to ww25.15. After a power reset the blink sketch does not resume running. In addition to the problem that you report I'm also unable to connect any longer to the serial console so I have no idea what's going on. This is the 3rd board that I upgraded to 25.15 and each one is experiencing problem and I regret having upgrading any of them. Hopefully we will see new FW release soon that address these issues.
Hello PranavSanghadia and crossi,
This behavior has been reported. Apparently it is an issue with the latest image where the Arduino sketches are not able to run after reboot.