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 - 22.214.171.12494
serial - YHOOGY567951
everything else (thus far) seems to work flawlessly.