Qt Creator window completely transparent, black, or gray every few minutes

The Qt Creator 4.10.2 IDE window periodically turns transparent (when not in fullscreen mode,) black (when in fullscreen mode,) and gray (when using 4.11.0-beta2.)

Please see the attached screenshots.  Screenshot at 10.20.13 shows an example of this bug on 4.11.0-beta2. Screenshot at 10.20.23 shows what happens when I mouse-over various elements, and when I select text in the editor. The other screenshot shows Qt Creator after taking it out of fullscreen mode and then returning it to fullscreen mode.

I don't know if this problem affects other macOS environments or any Linux or Windows environments.