Packaged build menu buttons not working (works perfectly in editor) – UE 5.4 / 5.5 / 5.6

Development Asset Creation
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1

Unreal Engine Version: 5.4, 5.5, and 5.6
Project Type: Blueprint
Platform: Windows 64-bit
Packaging Type: Windows

Issue:
After packaging my project, the main menu loads fine, but none of the buttons work except for “Quit.”

  • Clicking Start Game or Credits causes the screen to blur for half a second, then it stays on the menu screen.

  • In the editor, everything works perfectly — all buttons function as expected.

  • This issue now happens in multiple projects, including one I haven’t touched since it last packaged and ran correctly months ago.

What I’ve Tried:

  • Verified this isn’t a blueprint scripting issue (works perfectly in editor).

  • Tested in UE 5.4, 5.5, and 5.6 – same result each time.

  • Verified Unreal Engine installation through Epic Games Launcher.

  • Completely uninstalled all UE versions and did a clean reinstall of UE 5.6.

  • Tried packaging older projects that previously worked – same issue.

Is there a known issue with UI input or level transitions in packaged builds for recent UE5 versions? What else can I check or reset to fix this?

2

Hello there @Gamer94152!

That is a strange issue you are encountering. Since scripting is working as intended in Editor, and the problem is appearing across different projects, the issue must be tied to a missing or invalid element in your UE setup.

Since you already performed a reinstall, I would suggest a full clear of all Epic software in your system, then install again. Please follow these steps to do so:

  • First, uninstall the engine, launcher, any asset packs, etc
  • Next, open the registry directory HKEY_CURRENT_USER\Software\Epic Games\Unreal Engine\Builds, and delete any build entries
  • Finally, delete the folders %userprofile%\AppData\Local\UnrealEngine and %userprofile%\AppData\Local\UnrealHeaderTool
  • After that, no elements related to UE should be left in your system
  • Now, reinstall UE launcher from scratch, and only add the latest version of the engine
  • After the process is complete, open a blank project, add a simple menu button to it, and pack it