So this is when you start getting worried....?
When you have paid for an item almost a month ago and haven't recieved it and the seller is ignoring your pm's?
I am not freaking out yet since I am in Canada and I know stuff sometimes takes mysteriously long to arrive (I think my mail lady secretly hoards all my fluffymail and then delivers it all in one big pile ). So when sellers communicate back I'm usually ok with waiting it out a little, but when you see them online but no response to your pm's make me just a little leery - so hopefully she has just missed them. I want to give her a chance to respond before filing with pp.