We are aware of the issue, the latest Windows Insider release introduced a change to the OS that impacted Start11. We have an internal build that fixes many of the features that broke with this update and are preparing to release it as a beta as soon as tomorrow.
As a temporary workaround, if you left-align the Start button and change the icon, this will restore some functionality. Alternatively, we do caution that the Dev channel is fast-moving and we do our best to support users in those channels but with each release, there is a chance they could temporarily break compatibility with our applications.
