Gerhard Dangl Apr 15, 2017
> Hi Gerhard,
> The screen shots did the trick. After setting the same lat/lon,
> time, etc., I got the same behavior. If I center on the RA/dec
> for the "mp_off" image, most of the minor planets are missing;
> move a little, and they go back on again. That allowed me to track
> down the bug. It would affect any wide fields near the ecliptic
> Guide has some code that computes a rectangle, in ecliptic
> coordinates, that covers the on-screen rectangle. It can then very
> quickly recognize that most asteroids, at the currently-specified
> time, cannot possibly be in that range of ecliptic latitude or
> The code in question makes displaying asteroids a _lot_ faster.
> But for some wide fields near the ecliptic poles, it could decide
> that the range in ecliptic longitude was effectively zero. That
> made it run even faster (since it would mean there were almost
> no asteroids to display), but it wasn't really what you would
> want to have happen. Fortunately, changing one line of code
> caused it to work properly.
> To ge the fix, download one of the following files and unZIP
> it in your Guide folder :
> Use the first for Guide 9 or 9.1, or the second for Guide 8.0.
> Things are actually a little trickier for Guide 8.0 users (though
> not by a lot); they should take a look at the following :
> Essentially, this boils down to "don't apply a Guide 9 update
> unless you've applied the latest Guide 8.0 update."
> -- Bill