I did send an email about this to Channels DVR Support, but I am curious if anyone else as seen this issue.
I have a Fire TV Cube Gen 3. With beta version v2026.10.09.0549, when I try to launch Channels DVR beta, I am returned to the Fire TV Home screen after a few seconds. I tried clearing data and cache, and I also tried uninstalling the beta and reinstalling from the released app. I have another Fire TV Cube Gen 3 and it has the same problem.
The latest beta works fine on my Fire TV Stick 4K Max Gen 2.