I realise this is something of a 'how long is a piece of string' type question, but I'm hoping somebody here might be able to supply a clue as to the offending app
recently my middle button action in a browser (generally open link in new page/tab) has been hijacked, and for the life of me I can't work out who did it

'new' action on middle click is to send that application to the bottom of the stack, which is very annoying to say the least
I've checked all my settings and I've not installed anything that I can think of that might have had this effect, so I'm hoping that this might seem familiar to someone here
working with XP SP3 and a variety of browsers
any ideas?