We went looking for Web Design GUI apps. The most recommended is Kompozer.
But its menus were all corrupted.
Then we found BlueGriffon, but it crashed when you tried accessing a dropdown menu.
Hmmm.
Themes!
Not Desktop Themes, but Application Appearance Themes:
In openSUSE 13.1:
Kickoff > Configure Desktop > Common Appearance and Behavior > Application Appearance > GTK
Change Oxygen to anything else, problem solved. For BOTH BlueGriffon and Kompozer.