I recently got an SSD and decided to reinstall Windows 10 Pro on it. Starting fresh, I installed Unreal Engine and all my usual dev tools. On my previous install of Windows, I had been creating a game with UE4 version 4.12. On my new install of Windows, I installed UE4 version 4.21 and opened/converted my 4.12 project. Everything seemed to work well, all my C++ code compiled, and the editor allowed editing of my game. However, upon saving my project via “Save All”, it crashes while displaying “Saving LevelName”. I’ve tried creating a separate empty level and then trying to save that; I get the same crash. I also tried using “Fixup Redirectors” on my content folder and that appears to succeed but doesn’t solve the crashing on save issue.
I just want to report that my problem seems to be solved by following these steps:
- Create a new project using version 4.21
- Open old 4.12 project in Editor version 4.21
- Choose “Migrate” on the content folder.
- Choose the new project’s content folder as the destination
- Open new 4.21 project in Editor version 4.21 and problem is solved
While I lose all my project settings and other such things, at least I still have all my assets, code, and levels working. This seems to be a bug as the conversion process from 4.12 to 4.21 should have automatically fixed any migration issues. However, my problem does seem solved, Thanks.