I've only had one really bad episode with IQFeed and some others were complaining as well (probably different forum and I don't recall where). I doubt it is just me. Some other feeds are much worse. Pretty much any unfiltered data feed is going to be susceptible to this to one extent or another. From my viewpoint, it only has to happen once to make me want a filtered backup data source.
Comparing forex is a problem, since it is not centralized volume.
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Using IB with Ninjatrader does not even provide proper-looking minute bars unfortunately.
This is easy to verify yourself. Open a plain 1 minute chart of something like ES and leave it running during RTH. Then at end of day, create another 1 minute chart of the same instrument (which is built using historical data which is corrected) and compare the bar highs/lows across the day.
Because IB bundles ticks, it can often miss sending the highs and lows of bars in live data.
Whether that matters to you is up to your style, of course.
IB actually provides an API call for "5-second" snapshots (H/L/C/V) that can be used to correct the live minute(s) bar so that it displays the proper high or low, but it needs to be implemented in the charting software to call the API and correct the current/live bar.