Latex interpreter not working?

I am adding this label to a figure I am plotting;

ylabel('$\kappa$','interpreter','latex','FontSize',30);

However, the \kappa symbol is not being displayed? Any ideas why? I've tried using other Greek symbols and they all seem to work fine. No idea why it's just this symbol.

Any help would be great, thanks.

I'm aware I could just use the \kappa symbol without the latex interpreter but I don't think the MATLAB symbols look all that good.

[Friedrich]

Which MATLAB version are you using on which OS?

The code works fine in 14a (64bit) on Win 7 (64bit).