I have checked the source for my snippet compared to one of the "old fashioned" that I had:

\begin{align*} P(X\leq150) & =\left(\begin{array}{c} n\\ k \end{array}\right)\\ P(X\leq150) & =\left(\begin{array}[t]{c} n\\ k \end{array}\right) \end{align*} As you can see, there is "[t]" in the array that is generating the problem, i.e., the array was top aligned. Are matrices in Lyx 2.1.0 set up by default on top alignment instead of middle aligment? I don't really remember changing this aligment. Sorry for the false report. Regards. ------------------------------------------------- Julio Rojas jcredbe...@gmail.com On Tue, May 13, 2014 at 4:41 PM, Julio Rojas <jcredbe...@gmail.com> wrote: > Dear all, > > I am on Ubuntu 12.02 with Lyx 2.1.0. I wanted to make set the binomial > coefficient for a binomial distribution, so I did as I alway did, i.e., > insert the parenthesis in my equation and a size 2 column vector in the > parenthesis. To my surprise the vector is not centered on the parenthesis, > but on the top element. Is doesn't mater if the vector is of even or odd > size; the vector is being setup from the top element to the bottom one. > This way the parenthesis are bigger than usual and the top part of their > space is empty. > > I don't know if I was completely clear, so I have attached a couple of > PNG's of the UI and a PDF showing this behavior. Again, I stress that this > exactly the same way I have doing it for years, so this issue is related to > the UI. Is there some new way of doing it on Lyx which I am not aware of? > > Thanks for your help. > ------------------------------------------------- > Julio Rojas > jcredbe...@gmail.com >