UE4's Blueprints: Why do they cause crashes so often?

[Fluppi393]

Hey all!

I am working with the UE4 for several weeks now and in the beginning I was really fascinated how many features it has and how well the Blueprint system works.
But as I began to create more complex stuff the Editor began to crash more and more often. Sometimes it would also crash when I was saving my project causing the loss of all my progress.
However, it didn’t annoy me too much (in most cases), until it occurred the first time that after a crash a corrupted Blueprint caused the project to crash on startup.
This isn’t a big deal if the corrupted Blueprint’s class isn’t referenced (e.g. in a “Cast to Node”) a lot and has no child classes, but it is a problem if it referenced a lot and has child classes!
As far as I experienced that all child classes can’t be opened any longer.
In my case my “Character” and “Item” base classes got corrupted, which made me lose days of work on them and their child classes!

So is there maybe a way I could fix those Blueprints and keep them?
Do you experience less problems when scripting via C++?
What are your experiences with Blueprint systems reliability?

Thanks for reading!

[Tim_Hobson]

Hi,

Can you post this on the AnswerHub as well? When you do post this on the AnswerHub can you include the following information:

Can you also include that if you are getting the crash, is it something you can reproduce with an entirely new project and blueprint?

Branch: 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)

Write a detailed description of the issue you are experiencing here. 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.

We encourage you to include screenshots or link to videos whenever they may prove helpful in understanding the issue.

Repro Steps

Action 1 (example: Open an Actor Blueprint)

Action 2 (example: Add an ‘Event Begin Play’ node to the EventGraph)

Action 3 (example: Connect the above to a ‘Print String’ node)

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 from your [project]\Saved\Logs folder. Additionally, you can please send us the CrashReportClient.log file located in C:\Program Files\Unreal Engine\4.0\Engine\Programs\CrashReportClient\Saved\Logs.

On a Mac, the logs are located in: /Users/UserName/Library/Logs/Unreal Engine/(project name)Editor/ The Library Folder is hidden by default. The easiest way to get to it is by having finder the active application and while holding Option Click Go in the Mac Menu Bar. This will expose Library.

[Fluppi393]

Thanks,
Here is the link to the AnswerHub thread: https://answers.unrealengine.com/questions/76128/ue4s-blueprints-why-do-they-cause-crashes-so-often.html
I wrote the information you were asking for into the answerhub question.