I was having this issue via Impulse, ever since 2 Impulse Updates ago.  Started having connection issues, but only in Impulse.  Not running any FW software or AV software, and I would intermittently get this issue - while checking out always causes this issue (2 purchases since that update).  The checkout would succeed, but I would never receive the receipt screen.  I just manually refreshed my game screen, and it was good.  Re-installed between 1st and 2nd purchase, and still had the problem.  For more info, see my thread in the Impulse forum.