I was stuck on US site once after looking at some items there. From memory I closed all windows and started with a new tab and clicked on my usual shortcut. Otherwise, shut the computer down and restart maybe?

I have also tried to buy something from a seller and when I questioned them on postage to Aus they said they didn't send to Aus, they were in the UK and only sold to Europe. They are still showing in the category search I sometimes do for these types of items, so there may be some issues with overseas cross pollinations these days.

So many changes lately, and from these discussion boards, so many glitches it seems!