Every time I open a blueprint, I also get a floating window that opens. It has a tab labeled “Document” and inside is no content other than the text “unrecognized tab”.
This has been happening ever since I recreated my project and imported all my code and assets from a project that was encountering an unknown error whenever I tried to package my project. (Even the log file said unknown error).
I should mention this is in Version: 5.3.0-0+UE5 built from source.
Platform: Windows 10 (22H2) [10.0.19045.5011] (x86_64)
Exact same issue on normal 5.4.4 (latest)
Same here
Version: 5.4.4-35576357+++UE5+Release-5.4
Maybe I might have fixed this.
Try [Window > Load Layout > Default Editor Layout]
I have since built the version 5.5.1 editor and migrated my project over. So far this issue has not occurred again for me.
The problem is caused by a broken layout.
Steps to fix:
1 (optional). Save your current layout: Window → Save Layout → Save Layout As
2. Find and open current layout .ini file in your text editor: Window → Load Layout / Save Layout → Hover over your layout’s name to show tooltip with config file location. A common location for user created layouts is %LOCALAPPDATA%\UnrealEngine<version>\Saved\Config\Layouts
3. Find this substring in the file (“TabId”: “Document”,“TabState”: “OpenedTab”)
4. Replace OpenedTab with ClosedTab for layout entries where this “Document” windowed tab appears
5. Save .ini file then reopen UE or load layout
