4.7.4 Crash on play

Just updated to 4.7.4 from 4.7.3, and now when I press play, UE4 crashes every time. I’ve tried disconnecting events in blueprints, to make sure nothing is being called when the game starts, but it still happens.
The post-crash error report log shows “Access violation - code c0000005 (first/second chance not available)”.
The project played fine in 4.7.3, and suddenly it crashes UE4. Is there a way to fix this?

Edit: I should also note that other projects seem to work fine. If I make a new project from the vehicle template, the crash does not occur.

Hi jos3ph,

Please zip and attach the crash log from your project so we can take a look. You can find it in your project folder under Saved. Thanks!

Hi Ben,
Here is the attachment. Thanks.
link text

Hi jos3ph,

Thanks! We’re looking into this now. When it crashed, did you submit the crash report? Next time it crashes like this, please include a description and select Send. Thanks!

Additionally, please try disabling the deferred dependency loading system (by overriding bDeferDependencyLoads in BaseEngine.ini to bDeferDependencyLoads=false). This will revert back to our old way of loading blueprints, and is more risky when it comes to cyclic dependencies, but it may unblock your project. Let me know what happens after trying that, as well. Thanks!

Hi jos3ph,

It looks like this crash is related to another we discovered in 4.7.4. (UE-13250) and a fix is on it’s way. In the meantime, disabling the deferred dependency loading system as described above should at least allow you to open the project again. If you still experience this issue once the fix has been released, please let us know. Thanks!

Hi Ben,
I have tried setting bDeferDependencyLoads=false, but the crash still occurs when I press the play button. I have submitted another error report referencing this question page.

Is it the same crash? Can you attach the crash log in the project with bDeferDependencyLoads disabled?

I’m not sure if it is the same crash. I have submitted another crash report referencing this thread, and here is the new crash dump. Thanks

Looks like the same crash. Thanks for checking that out for me! We were able to track down the problem, and the fix is forthcoming. Please respond to this thread after it’s released if it doesn’t fix your project. You should return bDeferDependencyLoads to True before then. Thanks!