This actually turned out to be a system-wide GUI issue. The solution was to open the Cinnamon Themes editor, and edit the Other settings
tab, and Controls
theme.
Special thanks to the two other answers that helped steer me in the right direction.
Tips: the “installed” theme, is only a general theme, and you must also edit the “Other settings”. I reccommend you open the following screens: 1 small terminal window, 1 small LibreOffice window, 1 small Nemo window, 1 small system settings windows (with buttons on it), and 1 small FireFox window. As you change the Other settings, the screen will automatically update showing the “styles” (my word) that you have selected. I had to play with this for quite awhile to figure out what changed what. In the end I selected the following:
Installed: BlueMenta -start menu, main screen, taskbar
Other settings:
Controls: Greybird -title bar and menu controls at top of windows
Icons: default -used in Nemo, .. (defaults to first item: Adwaita)
Windows borders: Menta -rounded corners, small top, think sides
Mouse pointer: DMZ-White -nice thin white line in Terminal
Keybindings: Default -I didn't change this
x Show icons in menus -to the left of the text
x Show icons on buttons -to the left of the text, for buttons in dialog boxes