Thanks for the comments.
Mormegil: I have taken a screen shot, but this email form wants to paste the url of my desktop image rather than the actual image. The image is 630kb. I need the ability to attach the image rather than its url. What am I missing?
Although I've been happily playing Gal Civ since Gal Civ I, I've only lurked and learned from the forum until recently. At this point I'm reluctant to call anything a bug unless I'm reasonably sure that such is the case. This is because for the last several years I've done my Gal Civ II and now III games on a Mac Pro which is now running Windows 10 on the current version of the Parallels VM.
I started playing with version 1.4 (didn't play sooner because of health problems and subsequent interstate move). Upgraded to version 1.5 and lost the icons for the planets on the right main screen list area. Other than that no known problems. Version 1.6 caused this problem. Another apparent problem is the "loss" of the planets in the diplomacy screen. Although the other small menu on the left and the major menu on the right remain, the planet display is also gone and "black". Since both of these screens worked in v1.5 I don't attribute their disappearance to a hardware or video card problem. The video card in this system is an ATI Radeon HD5770 which has 1 GB of video ram (Parallels won't let me dedicate >512MB however).