Can't edit post, page hangs then crashes

I am trying to edit the price on a classified post, I can go through the whole process of confirming Title & category, Item details, Photos, Price & payment, Contact but when I click "next" to go to the "promote" section the page just hangs and becomes unresponsive, and I have to force quit the page.  I have this problem on 2 different computers (mac and pc), and 3 different browsers (Edge, Chrome, Safari), so it seems like a bug at the trademe end.  Has anyone else had this problem, or know of a fix?