I thought I'd try this here because Google has revelaed nothing useful.  My kids decided they wanted two more Xbox controllers (in addition to two existing wireless units) so that when friends visit they can all play FIFA, minecraft etc.  I decided to get wired ones, given price, room dimensions and the avoidance of even more batteries.  Duly ordered two units from an online supplier and these arrived yesterday.

The problem is, when plugged in, they both take the same "slot", eg both appear as P1 if the wirless units are off - and only the last to be plugged in actually works.  I've tried using different USB sockets on the Xbox, which makes no difference.  There are several instances of this problem on the various online forums, but no definite solution that I can see. Any suggestions?  Unfortunately the supplier has no more in stock and there is a risk that if I get a direct replacement for one unit, this will be no better.