Ah, oops - that was actually the button showing when it shouldn’t. You’ve used your three invites, and the popup knows that so wasn’t showing any content - but it shouldn’t have been possible to get the popup to appear in the first place. The button now only appears when it should 
Oh ok - I didn’t realise I was limited on the number of invites!
Thanks for sorting it for me @kinetic
That’s on our list to re-consider, actually… 