# UE 5.6 projects broken and slow after 4.0 update **URL:** \ **Category:** Unreal Engine Plugin\ **Tags:** question, unreal-engine\ **Created:** [March 1, 2026, 1:29pm UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860 "2026-03-01T13:29:45Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Christopher\_Strommer](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/christopher_strommer/32/2935_2.png) [@Christopher\_Strommer](https://forum.convai.com/u/Christopher_Strommer)\ **Post date:** [March 1, 2026, 1:29pm UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860/1 "2026-03-01T13:29:45Z")
I’ve have two different chatbot character projects in UE 5.6. One is a Metahuman, the other is a Custom Character. Both projects have the same issue since the update. The chat widget ignores my first input and only recognizes my second input after a nopticable delay. The response then also has a bigger delay than usual. Both projects ran perfectly before the recent 4.0 update. I tried re-installing the plugin but that didn’t help. Tried setting extra Params: “MinBufferDuration=0,MaxBufferDuration=0” but that didn’t help. I’m thinking about reverting back to the previous plugin version. Here’s a video showing both projects after the recent update: [![](https://canada1.discourse-cdn.com/flex004/uploads/convai/original/2X/d/dbb37f2cbe343e3b8f8d3129508c305df379bd9f.jpeg "Convai 4.0 Broken Projects") ](https://www.youtube.com/watch?v=LsmXZ0CZihM) ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [March 1, 2026, 1:46pm UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860/2 "2026-03-01T13:46:43Z")
Hello, Version 4.0.0, as the version number suggests, introduces major architectural changes and is a beta, so it does include breaking changes compared to 3.6.9. V4 brings Hands Free, lower latency and a new backend pipeline, but many features are still incomplete, and the initial delay you see in your video is the connection / session setup tim **e** , not a bug in your Blueprint logic (you’ll see this in the logs as well). For details about what’s new and how V4 is intended to work, please check the Unreal beta docs and videos: [https://docs.convai.com/api-docs/plugins-and-integrations/unreal-engine-plugin-beta-overview](https://docs.convai.com/api-docs/plugins-and-integrations/unreal-engine-plugin-beta-overview) [![](https://canada1.discourse-cdn.com/flex004/uploads/convai/original/2X/4/4619c16815de3a0deac2b866d80c7ad7c8bc10a3.jpeg "Real-Time AI Conversations & Facial Animation for MetaHumans | Convai Unreal Engine Tutorial") ](https://www.youtube.com/watch?v=4fMCKkrfyaA) If you need fully stable behavior right now, you can temporarily stay on 3.6.9. ---
**Author:** ![Christopher\_Strommer](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/christopher_strommer/32/2935_2.png) [@Christopher\_Strommer](https://forum.convai.com/u/Christopher_Strommer)\ **Post date:** [March 2, 2026, 12:36pm UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860/3 "2026-03-02T12:36:19Z")
Thanks for the quick reply. Can you give me an estimation for how long the beta will last? ---
**Author:** ![Christopher\_Strommer](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/christopher_strommer/32/2935_2.png) [@Christopher\_Strommer](https://forum.convai.com/u/Christopher_Strommer)\ **Post date:** [March 7, 2026, 5:37pm UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860/4 "2026-03-07T17:37:25Z")
Hi! If you can’t speak to the duration of the beta can you tell me how to revert my convai plugin back to the 3.6.9. version? I tried deleting the plugin folder and replacing it with the one from github release page but that didn’t help. > **[Releases · Conv-AI/Convai-UnrealEngine-SDK](https://github.com/Conv-AI/Convai-UnrealEngine-SDK/releases)** > > This Unreal Engine plugin integrates Convai API for conversational AI and environment perception and action-taking by the AI in Unreal Engine. - Conv-AI/Convai-UnrealEngine-SDK ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [March 7, 2026, 5:58pm UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860/5 "2026-03-07T17:58:17Z")
Thanks for your question. At the moment, we are not able to share a specific timeline for how long the beta will continue. It will remain in beta until it becomes stable and the planned improvements are completed. If you would like to use version 3.6.9, you need to add the Convai folder from the 3.6.9 release into your project’s Plugins directory. After adding it, please check the installed version from the Plugins tab in Unreal Engine to confirm that 3.6.9 is active. If you continue to experience issues, feel free to share more details and we will be happy to help. ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [March 11, 2026, 11:13am UTC](https://forum.convai.com/t/ue-5-6-projects-broken-and-slow-after-4-0-update/5860/6 "2026-03-11T11:13:24Z")