 <p>I think I found another solution to this problem, which lets you leave the Colorized Parameter Help feature turned on.</p> <p>In Fonts and Colors, I specified a value for the "Signature Help - User Types(Value Types)" item, and I don't have the problem any more.</p> <p>Note: I also have the Color Theme Editor extension installed - I'm not sure if this plays any part in the effectiveness of the workaround (but I had it installed before as well, so the extension alone didn't fix the problem).</p> <p>Also, someone posted the bug on MS Connect: <a href="http://connect.microsoft.com/VisualStudio/feedback/details/770603/text-editor-the-type-color-for-structs-is-black" rel="nofollow">http://connect.microsoft.com/VisualStudio/feedback/details/770603/text-editor-the-type-color-for-structs-is-black</a></p>