In 14.04 I am using Ambiance theme with Cinnamon, and in Cinnamon Settings there was definite corruption (black backgrounds on the "tabs") that was solved by disabling overlay-scrollbars. Maybe there is something that Cinnamon Settings can be doing differently, but wanted to note that even with Ambiance theme there is this problem with certain apps. So, not "just a theme problem".
In 14.04 I am using Ambiance theme with Cinnamon, and in Cinnamon Settings there was definite corruption (black backgrounds on the "tabs") that was solved by disabling overlay-scrollbars. Maybe there is something that Cinnamon Settings can be doing differently, but wanted to note that even with Ambiance theme there is this problem with certain apps. So, not "just a theme problem".