I have been trading with IB for 20 years on and off and now recently, all I get is ? marks in my bid/ask fields for half of my contracts. I have called tech support about 8 times and they try a few things which allow me to get data for a few minutes then it drops again and all I see are ? marks. It seems like a popup or firewall issue but the last tech support dude said mine were all ok. I have all of the required market permissions for what I am trying to look at. Any ideas?