Comment 2 for bug 338930

Braces around most fields is overzealous. Many fields do not require double braces at all, in particular fields with integer numbers.

Inspired by this thread which describes a very similar problem: http://tex.stackexchange.com/questions/10587/latex-error-when-citing-paper-with-similar-authors-and-same-year-using-natbib , I created a small patch (attached) to only protect titles when the "protect capitalization" option is used. I expect this patch will solve the bug described.