the new app requires hub running version 2.3.8 or later. For more details on the platform release, please check out this section: Release Notes - Hubitat
as with any beta release, your experience may be different than that of the final and public version of the app.
Click the link in the first post, you will either have a join program button or leave program.
Once joined, use the link to the app I posted above to get the new app.
In this forums section this post is in would be best.
I find it most helpful to post each separate issue as a new topic. If you find an existing topic about the same issue you can reply with confirmation that you can reproduce it, and/or more details.