How do I report a bug?

I have discovered an issue with the Editor or with another component of the Unreal Engine 4, and I would like to report it to Epic.

How should I do this?

Thank you for helping to improve the Unreal Engine!

Please remember to always Search the AnswerHub first, to see if your issue has already been reported.

If you issue has not been previously reported, then please report all bugs here on the UE4 AnswerHub. To do so, click on Post a Question. Set the ‘Section’ to Bug Reports.

Please make a new report for each separate bug, and use the following format whenever you are able:

Build Type: Is this a ‘Binary’ build from the Unreal Launcher, or a ‘Source’ build from GitHub?

Build version: The version number of the Unreal Engine which you are currently experiencing the issue on. For example: 4.0.1 - 2027741 (This is found in the editor under Help > About Unreal Editor)

Detailed description of the issue: Please remember to include all potentially relevant information, such as whether you have confirmed that the issue is occurring with default settings, or if it is only with your custom project. If you have experienced a crash, then the Crash Reporter window will appear and prompt you to submit the crash information. Please submit the information, but also please use the Copy to Clipboard function, and paste the results in your AnswerHub post. This will allow our support staff to quickly track down the crash details.

Screenshots/Link to video: We encourage you to include screenshots or link to videos whenever they may prove helpful in understanding the issue.

Repro Steps

  1. Action 1 (example: Open an Actor Blueprint)
  2. Action 2 (example: Add an ‘Event Begin Play’ node to the EventGraph)
  3. Action 3 (example: Connect the above to a ‘Print String’ node)
  4. Etc.

Let us know, does the issue occur 100% of the time for you with these steps? Or does it happen less frequently?

System Specs: (When needed - generally for rendering or performance issues) Tell us your operating system, your CPU, RAM, Graphics Card, and anything else which may be of importance. Feel free to attach your DXDIAG.

Attachments: If your bug is easily reproduced with a specific content asset, then we welcome you to upload a simple test FBX or .uasset which we can test with.

If you are experiencing a crash, then please provide us with the .LOG and .DMP files that are generated during the crash. Go to this link for details on locating different types of log files: A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums

Once again, thank you very much for your help in reporting these issues!

Hi Piinecone,

How do we determine which .log files are useful in ~/Library/Logs/Unreal Engine/(project name)Editor/ ?

Excellent question, we want to see the logs that were generated at the time of the crashes. If the logs are relatively the same and the reproduction steps are known, then the extra logs are not necessary.

I’ll update that information now too.

Thank you!


Thanks piinecone! I’ve updated the post to include the current location for Log files. The most recent log file will contain all the information we need. is the location i installed UE4 launcher. I had it installed seeveral times, rebooted and even tried installing in default location.

There is no problem with the editor or any projects. I am using UE4 source so i don’t care about downloading the binary files. My problem is with downloading the project files on marketplace which should be in vault. they stop halfway and all of them show like in the picture no matter for whatever version.

Hi kks21199,

I am sorry to hear that you are having a problem, but this particular post just exists to provide general information about how to report your issues. If you read the first part of the answer, you’ll see that we ask you to create a new post dedicated to your particular issue.

Please make a new post for your issue in the Installation & Setup section, and we will offer assistance to help you troubleshoot the problem.

I am locking this topic to prevent other discussions.