The only purpose of the downgrade was to verify that DAHDi would work on boot, as you had suggested that the 3 upgraded files would have had no impact on this.
I would like to be clear that on FreePBX13, everything worked fine. Upgrade to FreePBX14, DAHDi would not start on reboot. Upgrade to new kernel yesterday and DAHDi started to work on reboot. Upgraded wanpipe module to the latest version today and DAHDi stopped working again.
I'm very happy to upgrade again, and work with you to establish exactly what's going wrong.
Edit: @tm1000, Oh! you're post that I've just replied to has vanished.