See more at FAQ.md
UI elements overlapping with EMI
Switch to a lower GUI scale or tweak EMI's UI configs to your liking. Alternatively, disable EMI temporarily using Ctrl + O
Game crashes when generating a superflat world.
Lost Cities has issues with forcing players to spawn in a Lost City, and crashes when attempting to generate a superflat. Remove the mod to generate a superflat until the issue is fixed.
Game crashes on MacOS
Remove Spark and ensure you are using an ARM64 version of Java 17 or higher
Mod versions do not match when connecting to server (example pictured here)
Odds are your config doesn't match the ones on the server. If the server is running on Hard Mode, make sure that you've updated your client too
GregTech textures are all switched around
GregTech uses dynamically generated textures - reloading your resource packs may break this. Restart your game to fix it
Monifactory is built off of multiple mods that are at various stages of completion - it is not uncommon for a bug to be caused by one of these mods instead of Monifactory specifically. If you are unsure whether a specific mod may be causing a bug, try to replicate the bug on a new instance with only the mods necessary to re-create the issue. If you can do this, then the bug should be reported to that mod's developers instead of those of Monifactory
The most frequent offenders are listed below
Issues with EnderIO Modern
EnderIO 1.20.1 is not in a great state. Updates and fixes are infrequent, so most features may have bugs or cause crashes - some items and blocks are made unobtainable for this reason. For item and fluid conduits specifically, try to use alternatives such as GregTech pipes, LaserIO, or a logisics option offered by an Optional Compat such as XNet
Issues with Nuclearcraft:Neoteric
Nuclearcraft:Neoteric is not in a great state either. Many features (including some aspects of fission reactors!) are incomplete or buggy
Issues with Gregtech CEu: Modern
GTCEu is being reworked and added to on an ongoing basis. You may run into the occasional bug, but these are addressed relatively quickly - please ensure you aren't creating a duplicate report before notifying the devs of an issue.
Issues with AE2
Although bugs with AE2 are infrequent, the AE2 team has shown little inclination to address bugs on 1.20.1 so your best option is to find a workaround after submitting a bug report.