R7000 upgrade to V1.0.7.6 breaks smart devices

I upgraded my firmware to V1.0.7.6 on my R7000 and connections to all my smart devices were broken and I cannot re-set them. I have tried rebooting the router and that didn't work.  I then re-set my devices to factory settings but I cannot connect to the network. Did something change in the firmware that affects smart devices? I have multiple devices with issues but we can use Wemo light switch for this discussion.

I did not take note of the previous firmware version so have not downgraded yet.

Thanks in advance.