Flashback Fixes

An addon to Flashback 1.21.11 that patches bugs. Currently fixes the reset GUI bug that happens on Lunar Client and a crash that occurs when previewing keyframes on a cropped aspect ratio

764 Downloads

fabricutility

Rent Server with this Mod

About this Mod

An small addon to Flashback 1.21.11 0.39.5 that patches bugs.

Current fixes:

Lunar Client GUI layout not saving
Crash that occurs when previewing keyframes on a cropped aspect ratio
Network protocol error from replayed mod custom payloads

Available Versions

Flashback Fixes 0.1.1release

MC 1.21.11fabric

May 17, 2026

Flashback Fixes for MC1.21.11-0.39.5release

MC 1.21.11fabric

May 15, 2026

How to Install Flashback Fixes on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

Install Mod

Open the mod browser in the dashboard and search for "Flashback Fixes". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Flashback Fixes server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is Flashback Fixes compatible with fabric?

Flashback Fixes officially supports fabric for Minecraft 1.21.11. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Flashback Fixes – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Flashback Fixes consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.