<p>I see this problem with Chrome 14.0.835.186 on Ubuntu 11.04 (classic mode). </p>

<p>Today is the first time it has occurred, but when it did, only one of two uses of <code>\sum()</code> had smushed brackets (see below). The question <a href="https://stats.stackexchange.com/questions/16508/calculating-likelihood-from-rmse">Calculating likelihood from RMSE</a> (I edited the first equation to <code>\sum\left(...\right)</code> thinking it would help, but it didn't).</p>

<p><img src="https://i.stack.imgur.com/NJSkQ.png" alt="enter image description here"></p>
