I've read a few posts similar to this... but they're all months/years old.
I've tried to watch several movies via the Roku Channel... namely "Children of the corn" and "Hellraiser". When selecting to play either movie, it attempts to buffer and then immediately spits me back out to the play menu.
Here are my specifics:
model # - 3810x
Software ver - 184.108.40.20694
serial - YHOOGY567951
everything else (thus far) seems to work flawlessly.
Can you please provide more information about the issue you are experiencing? Does this happen on all movies/shows in The Roku Channel or just specific titles? In addition, can you please specify the exact steps you are taking to reproduce this issue so we can investigate further?
With more information, we will be able to assist you further.