This is a line chart on the latest Infragistics (8.2 .net 2.0).  I would say I have about 500 points or so when I first start, that I use a NumericTimeDataSeries to bind to and add to the graph's series, and also I add points dynamically about every second to that list.  The treatdatetimeasstring is = false (so I get time on the xaxis).  The scrollscale is enabled on both the x and y axis, however the error comes when I click the + sign on the xaxis scrollscale (not tried y axis one).  The x axis is set to auto (so it shows labels automatically given Infragistics ranges).  It usually occurs when I first bring the form up, and I quickly click the + a couple times.  It exceptions pretty consistently, every couple times or so, so it should be reproducible. 

 Thanks!  I really need this one fixed for sure. 

NumericTimeSeries series;

void timer_Tick(object sender, EventArgs e)
{
   Random r = new Random();
   series.Points.Add(new NumericTimeDataPoint(DateTime.Now.AddDays(r.Next(500)), r.Next(500), "point", false));
}

That looks like similar to mine, except when the timer ticks, add about 50-100 points, also you are adding days to your datetime, my points are about 100 ms apart, and my Y axis values are about 0.0000003 +- a .0000001.  It happens almost every time, when I first open the form, and then quickly click the + a couple times on the scrollscale.  Is there any part of the code on clicking that has some kind of timing involved?  I assure you it's happening on version 8.2 (latest)  Infragistics.   I appreciate all the help, this is a serious crippling problem for me!

Sorry, still not getting the exception (using 8.2 build 2022, which is the latest hotfix build). This time i'm adding 100 points on every tick, all within 100ms. The only thing that happens when you click the scrollscale is the visible window coordinates change and the chart repaints Perhaps you can create a sample project and post it here. That might help reproduce the problem.

Sorry I was on business travel and unable to respond until now.  I appreciate very much the hotfix.  What number hotfix will it be, and when will it be out?  This problem still occurs consistently for me so it is absolutely necessary to have this fix, as it is a serious problem.  As soon as the hotfix is out I will update you on whether it worked or not. 

I can send you the little sample project I made, but it only occurs one in 5 times, but it really depends on PC specs probably, etc.  I can't send the full software unfortunately. 

I was still unable to reproduce the problem with your code. I tried it both as is and in form load. Regardless, I have added null reference checks to both Scroll and Scale methods of the axis. The changes should be available in the next hotfix, although I cannot fully guarantee it will solve the problem. In the meantime, it would be best if you could submit a stand alone project to developer support for testing. This way they can log a bug for you.

The adding to trhe series is NOT done in my real UserControl in the constructor.  It is instead done AFTER the form has loaded. The problem exists in both places, regardless of whether done in form load or not.  There's a null reference somewhere due to timing?  Can you recreate it with my code there?  Move into to form load, it'll do the same thing.  Thanks.

You should move all the code from the form's constructor into the form's load event. The constructor should only be used to initialize properties and variables. I bet it'll work fine from the load event.