Premium stash tab upgrade not showing

Hi

First off, after my initial trouble with getting the game to run, now fixed, I am loving it, awesome awesome game.

Secondly, Merry Xmas.

Lastly, when you get back from eating turkey, celebrating and drinking too much mulled wine I am having an issue in getting my upgrade to premium stash tab to show up.

I did cycle through the tabs to see if there was an option to set of of them as premium, nothing showing though.

Tried restarting game also, still no change.

Many Thanks