Hi David,

Just did a little checking... most stars stay visible even at
.001-arcsecond fields of view, but orbital binaries are an
exception. Problem here is that Guide first checks to see
if the nominal position (for the center of mass) is on the
screen. Then it computes positions for each component
based on an assumed ratio of masses. So you can get
a situation where the component is on the screen and
ought to be shown... but because the center of mass is
off-screen, Guide rashly discards that star.

Not a horrible bug, but fixing it required moving one
line of code down a bit (checking to see if the _star_
was on-screen rather than if the _center of mass_ was
on-screen). So I fixed it.

-- Bill