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Crash every time I use "Undo"

Started new level and I'm still placing initial level architecture, so there isn't much to the level/project. When I try to undo anything, the whole UE4 crashes. Doesn't matter how big or small my undo is - could be moving rotating an object 10 degrees, could be flipping the world - crashes EACH time.

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asked May 13 '14 at 06:19 PM in Bug Reports

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avatar image gmpreussner STAFF May 13 '14 at 07:48 PM

Hi, sorry about the crashes. Could you please attach the Editor's log file? That may provide more details about what's going on. Instructions are here: https://answers.unrealengine.com/questions/12363/how-do-i-report-a-bug.html


avatar image Jeul May 14 '14 at 08:03 PM

I tried looking into the log files and there are only two files, both from a month ago or more. There is no crash log for the recent Undo crash. Part of that might be caused by the fact that I have to use Task Manager to end process in order to get out of it - the engine itself doesn't display a crash message of any sort.

To give you an example of what I'm working with, it's a collection of boxes formed to make walls, and I only have about 8-9 small rooms made this way, without materials added or anything.

If I could post more information, I would.

avatar image Jeul May 15 '14 at 09:45 PM

I have started a new project and it's doing the same thing.

"We apologize for the inconvenience. Please send this crash report to help improve our software.


This was after I put in some basic starting level architecture and one Box.

At this point, the UE4 editor is kinda unusable for me. I can't even start a new project over and start to build without it crashing, locking up, or taking 10 minutes to undo an action. I'll try uninstalling it and re-installing. Not sure what else I can do. =\

avatar image gmpreussner STAFF May 16 '14 at 06:02 PM

Can you attach the log from your project? It is located in /YourProject/Saved/Logs/MyProject.log

If you have started the Editor again since the last crash, that file will have been renamed to MyProject-backup-xxxxxx.log, where xxxxxx is the date and time of the backup.

avatar image Jeul May 16 '14 at 08:28 PM

Alright, here is a .zip file ( won't take txt or rar, but you'll take zip? ) of all of the logs and .dmp files:

link text

logs.zip (160.4 kB)
avatar image gmpreussner STAFF May 16 '14 at 08:39 PM

Got it, thanks! Looks like the crashes are actually happening on the rendering thread. Would it be feasible for you to provide the entire project along with the exact repro steps, so i can try to reproduce it here?

If necessary, we can arrange for uploading those files privately, so you don't have to share them right here.

avatar image gmpreussner STAFF May 16 '14 at 08:45 PM

Actually, before you send your project, it might be sufficient if you can just give me the repro steps. That is, if you are able to reliably reproduce the crashes. If it crashes randomly, this will be more difficult to debug :)

avatar image Jeul May 20 '14 at 09:42 PM

Alright, I've been putting it through the same things I did before the reinstall and it seems to be alright. It still seems to hang quite a bit on Undo - about 30 seconds or so when using Undo on geometry boxes for movement, scale, etc. It doesn't seem to hang as much on other actors, though, and even the 30 seconds isn't unusable, it's just very out of the ordinary, so that's why I mention it.

It appears as though a fresh install did the trick. I ended up losing the old project, but that's no big deal as long as I have the editor working well.

Thanks again for your help and if I have issues in the future, I will post them! :)

avatar image Jeul May 16 '14 at 09:21 PM

Like I mentioned, when I reinstalled UE, every actor in the project was deleted - the project was empty aside from the name. If I wrapped it up now, it wouldn't contain much, i don't think.

I am trying to reproduce it again, just by building the same scene. When I did this before, it would crash the same way. Let's see if it does again. I will post my results here, either way.

Thank you very much for your help. :)

avatar image Jeul May 16 '14 at 07:04 PM

Alright, I found the file(s) you're speaking of. Important side note - after I uninstalled and re-installed UE4 yesterday, when I went to pull up the same project ( name is a515newbuild ) and it was there, but every actor in it was deleted. I messed with it a little bit, but seeming as it was empty, I just created a new project ( which has similar slowdown and crashing issues ).

I see 6 text documents in the folder for a515newbuild and 2 .DMP files. Would you like me to attach all 8 of these?

EDIT - When looking at the 'backup' files, there are 5 of them, 4 of them are <40k, one of them is 920k and is too large to upload to your forum here.

avatar image gmpreussner STAFF May 16 '14 at 08:17 PM

You can zip them (might have to rename to .abc or something else) and email me at max.preussner@epicgames.com I only need the YourProject*.log files. Thanks!

avatar image gmpreussner STAFF May 27 '14 at 03:30 PM

Hey Jeul, got any update on this?

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It seems as though a full reinstall was all that was necessary, as it seems to be working just fine now. I used level geometry to build what I needed to and it seems to be working. There is still a noticeable delay when I use the undo in regards to anything involving level geometry ( about 10-15 seconds, compared to instant with any other undo ), but it's manageable.

Thank you again for your help. If there is another problem, I will start next time with a fresh install of the most recent UE4. :)

( Sorry I didn't post before this to update you. Thanks again for checking on it! )

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answered May 27 '14 at 06:52 PM

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