When zooming in far enough, nebulae don't show

Hi,

I am running Starry Night 7 Pro Plus (7.3.0.533 leEW) on Windows 7 64-bit, but when I zoom in on say the Saturn Nebula, eventually the sky image disappears, meaning the Saturn Nebula fades away, and it only shows rendered stars.

I have tried looking around for settings, but I don't see anything that controls this. I have all of the File / Settings / OpenGL and Shader settings turned on. My video card is more than up to the task (AMD Radeon 7970), as I use this as a gaming PC. I have 8 GB of RAM, and Starry NIght is only a 32-bit program, so it couldn't use more than 4 GB of RAM anyways, and I have confirmed I still have at least 3 GB free (3.8 as I am writing this), so it can't be a memory issue, 

I also experienced this on a second computer so I know it is not some weird fluke on my machine.

Does anyone else have this problem or know of a setting for this, or is this a bug to be reported?

(Weirdly, I find that if I click on the Saturn Nebula search result so that it goes to the time at the highest point, then it will start showing the Saturn Nebula when I tell it to Magnify. But it should work right at startup, not require weird workarounds.)

I have attached two images that show the problem. The first one is just opening Starry Night, searching for the Saturn Nebula, and then clicking on Magnify, wating for the zoom to finish, and then taking a screenshot. The second image is the same operation, but after going to the highest point event.