Black toolbar

After upgrading from Ubuntu 14.04 to 16.04, my LibreOffice toolbars are “black” which makes it very difficult to see the icons, particularly with icon style, “Breeze.”

I have tried renaming the registrymodifications.xcu file and renaming the /home//.config/libreoffice/4/user (LibreOffice 4 & 5) folder. Neither solved the problem.

Any thoughts would be appreciated.

Thanks.