Did you visit and leave the channel store after updating? After removing?
If you removed and added again a channel between store visits (and between automatic syncs), then it might not do anything.
If you added the original private channel using the automatically generated code, and not the vanity code, it will most likely be an install of that specific version. I'm not sure what happens when that specific version is no longer the pending or published private channel.
-- GandK Labs
Check out Reversi! in the channel store!