Charts - sporadic bug, not showing the planet.

[johanley]

Example: main page, listing of planets has links to a chart. I click on Mercury's link. The chart shows, but with no icon or text for Mercury in the center. A few minutes later, the bug is not reproduced. Doesn't seem to be common. (I saw it with the default location, at about 9:05pm EDT 2017-07-17).