Hi,
I am using Fedora 27 Cinnamon. I notice many application within the OS would have this problem, where you can't read anything, because the background and the letters are nearly the same color.
One application is Playonlinux.
Screenshot from 2017-11-23 13-02-00.png
However, the same issue would happen when using Firefox as well as the other application.
My current theme is below.
Screenshot from 2017-11-23 12-56-00.png
I hope you can help.