I have encountered "This item can not be traded." as well as "This item has changed during the process. Please try again." I understand the first one, though non-tradable items shouldn't be allowed on the market, but I'm rather stumped on the second message. I tried a few times, and got the same result every time. Does anyone have a solution?

The second one usually means that whoever was selling it was fucking around with the price each time.

And yes, the first part does my head in.

Yeah, that's what I would guess it means but it doesn't seem to be changing at all. Just one of those market mysteries, perhaps.