Thought I would create a topic for issues with the (unofficial) Beta on ATV thread. Feel free to post and I will edit, or mods can edit at free will to add issues and possible fixes while we wait for an official release.
Q. My Library wipes/disappears after a random amount of time.
A. No resolution yet.
Q. My media doesn't appear to be scraping.
A. Try going into Settings - Media and removing Video local sources. There is a bug where it'll go into an infinite scrape loop trying to find data. After this, restart via exiting boxee/restarting your ATV or 'sudo reboot' if SSH is your thing.
Q. My remote doesn't appear to be working!
A. This appears to be an isolated problem. Most users report much more responsive remote as well as user interface. Try re-pairing your Apple remote in the ATV Settings - General - Remote page.
Q. My apps disappear at random times!
No fix as of yet apart from cycling power.