IQfeed service is terrible. They lost quotes of many stocks from June 16th to July. It's been a week and the problem is still there.
If you query IQFeed for AAPL minute bars between 6/16 and 7/1 there is a void for example. I also see voids with IBM, C, GS to name a few. ES seems fine, so maybe futures are unaffected. I am only looking at minute bars, so maybe tick/daily data etc are okay?
I have the list of symbols, if anybody wants it PM me.
About 1200 symbols, tick and intra-day intervals back to the 20th of March.