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v40.00 Known Issues
Hello Fortnite developers,
During pre-release testing for v40.00, our expanded testing process helped us to identify a number of issues that were fixed before the build was finalized for distribution. However, a few iss…
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21
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6499
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April 3, 2026
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v40.10 Known Issues
Hello Fortnite developers,
All significant issues identified during pre-release testing for v40.10 were resolved prior to release. We’ll update this thread with any issues identified post-release.
v40.10 also includes …
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4
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546
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April 3, 2026
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Your Feedback and Bug Reports Help Shape the Future of Fortnite’s Developer Tools
Your feedback directly shapes the future of Fortnite and Unreal Editor for Fortnite (UEFN), informing how we evolve our tools, features and roadmap. Today, we’re sharing how we turn your input into action using two custo…
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14
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438
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March 19, 2026
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[FORUMS] Editing Bug Reports Causes Escalation Issues
Hey folks!
We can escalate posts in the Issues and Bug Reporting forum to create a ticket for us to view. This makes it easy for us to get more information from you and for the developers to see exactly what the issue i…
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13
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1821
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February 11, 2026
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Billboards randomly not showing to Join-in-progress players
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69
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1301
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April 3, 2026
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Island Settings and Team Setting & Inventory Devices are no longer working together.
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1
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4
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April 3, 2026
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Calling a function with Optional Named Arguments without providing them crashes the server
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2
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103
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April 3, 2026
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Wildlife Spawners will not remain agressive for Raptors and other predators. Works in Local UEFN but not a live game or playtest
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8
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152
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April 3, 2026
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Broken Vertex-Wind Logic/Modern Foliage Assets (SpeedTree/Nanite) remain almost static in highintensity weather phases in each mission compared to legacy asserts
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5
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190
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April 3, 2026
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Continuous shooting
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0
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3
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April 3, 2026
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Continuous shooting
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0
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2
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April 3, 2026
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Knocked down people when thrown by another player can't trigger mutator zones devices
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4
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33
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April 3, 2026
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UEFN 40.00 is easily 300% slower than previous version
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12
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300
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April 3, 2026
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Mutable doesn't respect Customizable Object Number of Bone Influences setting as Twelve and the output Mesh always have max 8 bone influences
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1
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1
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April 3, 2026
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Why is some foliage not showing in my session?
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11
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596
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April 3, 2026
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UEFN taking insanely long to save new actors
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3
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53
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April 3, 2026
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Fortnite Archive Files Error Control revision Error / Error Launching session
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2
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17
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April 3, 2026
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ui widget blueprint crashing uefn
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5
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88
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April 3, 2026
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UEFN no longer remembers the last monitor is was launched on
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2
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27
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April 3, 2026
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Terrain HLODs generating with dark outlines
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5
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47
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April 3, 2026
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Bug Report: Mission Blocked Due to Fully Upgraded Hero Abilities in lego Fortnite odyssey
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3
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32
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April 3, 2026
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Problems with updated Discovery maps
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11
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130
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April 3, 2026
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UEFN Editor Stuck at 75 or 83% Daily - Never Loads
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6
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52
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April 3, 2026
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Unable to load a live session in any map
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19
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155
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April 3, 2026
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Launch session - Cook failure out of memory
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8
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140
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April 3, 2026
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((errors.com.epicgames.common.processing
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9
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441
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April 3, 2026
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Missing Grass, Rocks, and new Foliage Setting in Fortnite Creative
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12
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290
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April 3, 2026
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Consumable Mushroom does not react correctly to Cutting and Pasting
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1
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5
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April 3, 2026
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VFX Creators and Spawners do not restart correctly.
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1
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16
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April 3, 2026
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When performing Jam Tracks, it may unexpectedly lower the BPM and raise it again.
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17
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73
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April 3, 2026
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