Coffeescript, syntax coloring of method arguments???

Odd problem. I run Darcula as theme. In coffeescript files, all method arguments get a white background, and black underlined text, making them pretty much unreadable, and looking extremely annoying...

When I go into the preferences for Editor->colors&Fonts->CoffeeScript, it doesn't happen in the example code there, and, also, can't even find a setting for method arguments...

Anybody else have this? Anybody have a solution? Help!