Can not purchase second guild vault tab.

I am currently trying to purchase a second tab for my guild vault, the 'Purchase' button is turning red but nothing happens when I click it.

Thanks in advance for any help!

I can confirm this is also happening to our guild. Not listed on Bugtracker either. Will report it.

Scratch that. Get a guild leader that isnt silly. Try taking the gold out the guild bank before you buy it. xD