Same problem for me. Last update was on the 12/09. I wonder if this coincides with their updates to be compliant with the revised payment services directive (PSD2) - they probably sent you a card reader etc.  Interestingly around that time, i couldn't log into the site either as it didn't recognise my user name - oddly it just randomly worked a couple of days later (on their site), but since then my QB doesn't sync either with error 102 despite re-entering login information and so on. 

If you have managed to resolve your issue please share - this is doing my head in!! I am not going to waste time and call, this clearly isn't a browser issue, more a connection issue QB<->Barclaycard and needs investigating. Albeit happily to stand corrected if i can get it working!!