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Load / unload Stream level crash

Build Type: Binary Unreal Launcher

Build version: 4.14.3-3249277+++UE4+Release-4.14

Detailed description of the issue: Got stuck in a big project where we used Lighting Scenario's to easily switch styles in an apartment. Everything works like a charm in PIE mode, but unloading/loading these streamed levels crash in standalone or packaged version. Happens 100% of the time.

Decided to test the matter in a new project to limit influencing factors. Started from the first person controller template and made the most simple lighting scenario switch I could imagine. Works in PIE. Crashes in standalone. 100% of the time.

Added testproject as Attachment Link

Basically unloading + loading another streamed sublevel set to lighting Scenario, in one blueprint call, crashes 100% in standalone...

Screenshots/Link to video: alt text alt text

Repro Steps

Action 1: Create New project from First Person Blueprint template

Action 2: Create 2 new levels, add a mesh in each in a different position, add them as sub-levels to the default persistent level, set as lighting scenario, and build lighting separately for each scenario.

Action 3: Use Load Stream Level and Unload Stream level in one blueprint event. (level blueprint or any actor or UMG blueprint is fine).

Action4: run in standalone mode, activate above blueprint event-->crash.

Attachments: sample project download link

Product Version: UE 4.14
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asked Feb 14 '17 at 11:26 PM in Bug Reports

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Im having the same problem. Looks like it is a known issue and is going to be fixed in 4.15 https://issues.unrealengine.com/issue/UE-38712

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answered Feb 15 '17 at 02:08 PM

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avatar image Sean L ♦♦ STAFF Feb 15 '17 at 02:35 PM

Hey KNote & Magruun,

This is correct, the issue has been reported as fixed for 4.15. You can also grab the fix commit and merge it into your engine if you are using a source build.

Thank you for your report

Have a great day

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