Weird bug, likely due to an indicator I've created, with blank chart.

[forrestang]

Hello.

I've come across an error, that only occurs when I use up to 8-9 charts, and that is a blank chart. The data is still there, but the chart is just empty. I know the chart is still there, as if I click and hold any part of the area shown in the image(boxed in area), the data will show up.

I suspect it is due to something I've used incorrectly with onRender(), and am trying to narrow down the issue. I think I've disposed on various strokes properly?

Another potential issue, is that I have an indicator where I add multiple different symbols to in State.Configure, so that is also a potential issue.

So I'm just wondering if there is a KNOWN mis-use of something that will cause this error? This does not seem to happen if I just have 2-4 charts open.

I see no errors in the log, or any errors in the output window. I've recreated my workspace with 9 charts, with no indicators, and am adding one at a time, attempting to find the error and recreate it, but it doesn't always happen right away.

[NinjaTrader_ChrisL]

Hi forrestang, thanks for your post.

I could not think of a reason this would only fail at 8-9 charts.

Please send me your log and trace files so that I may look into what occurred.

You can do this by going to the Control Center-> Help-> Email Support

Ensuring 'Log and Trace Files' is checked will include these files. This is checked by default.

Please reference the following ticket number in the body of the email: 3102719 Attn ChrisL

[forrestang]

Also of note, the trace file I sent, was likely after restarting NT, and NOT seeing that error.

I am unsure if the trace file will hold states of prior NT sessions I may have had open?

So would I need to have a trace file sent, at the time I notice the error?

[NinjaTrader_ChrisL]

Hi, thanks for sending that

The trace files folder adds a trace file every time you open NinjaTrader.

You are getting this error in the trace files, if this is the correct indicator then it could cause a blank chart window if the OnRender method is not working properly:

ERROR: Indicator 'PriceLineScrollable': Error on calling 'OnRender' method on bar 5612: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

This subject has been discussed in this forum thread:

https://ninjatrader.com/support/foru...otected-memory

Also, see the best practices for working with SharpDX brushes here to see if this applies to your code:

https://ninjatrader.com/support/help...arpDXResources

Best regards,
-ChrisL

[forrestang]

Hi, thanks for sending that

The trace files folder adds a trace file every time you open NinjaTrader.

You are getting this error in the trace files, if this is the correct indicator then it could cause a blank chart window if the OnRender method is not working properly:

ERROR: Indicator 'PriceLineScrollable': Error on calling 'OnRender' method on bar 5612: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

This subject has been discussed in this forum thread:

https://ninjatrader.com/support/foru...otected-memory

Also, see the best practices for working with SharpDX brushes here to see if this applies to your code:

https://ninjatrader.com/support/help...arpDXResources

Best regards,
-ChrisL

Ah... that error was me attempting to try to change something... AFTER I got the blank screen. I was just playing around with the OnRenderTargetChanged() function.

I thought maybe I had an issue with not disposing of some brush, but was not the case.

So if that is confusing... essentially I created that error AFTER this blank screen bug popped up.

[NinjaTrader_ChrisL]

Hi, thanks for your reply.

Do you get this on any other indicator like the SampleCustomRender indicator or only when you use your indicator? If you add Prints to the OnRender method do you see it stop printing when this happens to the chart? Also make sure you have the latest drivers for your video card installed and are not using anything like a monitor connected through USB (adapter).

Best regards,
-ChrisL