screen sometimes doesn't turn sideways

[mlevin77]

The orientation sensor in the phone seems to work, because I can do the "alignment" thing (which shows two "levels" that respond when I tilt it) and sometimes it does turn the screen. But it's unpredictable; in composing an email for example, if I rotate the phone, nothing happens. What am I missing about the way it rotates portrait vs. landscape?

thanks,

Mike