UEFN map viewport completely black - actors exist but nothing visible

Summary

The viewport is completely black. Actors exist in the
Outliner but nothing is visible.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

World Building

Steps to Reproduce

  1. Open existing UEFN project in Unreal Editor for Fortnite 5.6
  2. Wait for project to load
  3. Observe that the 3D viewport is completely black
  4. Open Outliner - actors are listed correctly
  5. Open World Partition - all cells appear dark/unloaded
  6. Press F in viewport - no response
  7. Try Alt+2, Alt+3, Alt+4 for viewport modes - no response

Expected Result

The 3D viewport should display the map content
and all World Partition cells should load correctly.

Observed Result

The viewport is completely black. Actors exist in the
Outliner but nothing is visible. World Partition cells
appear unloaded. Viewport shortcuts (F, Alt+2, Alt+4)
do not respond. All Map Check errors have been resolved
(streaming mismatches and illegal asset references fixed).

Platform(s)

Windows PC

Island Code

6014-2079-6723

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Additional Notes

I think this issue appeared suddenly. Before this session the map
was loading correctly. Map Check shows 0 errors after fixes.
UEFN version 5.6