2.0.4.0 _EDIT: Beta_
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I can't find a way to disable the sprint-toggle. I've searched everywhere but I can't find anyone talking about this or what mod enables it.
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My issue with this "feature" is that it works the other way around too. If I toggle sprinting on by accident, when I try to sprint by holding the button down normally, it instead toggles sprinting off and I can't sprint.
@ObZidianLP did a log out and in again. Did you check the cotrols menu and look maybe sprint have use another key ?
@Dream-Master I tried restarting my game multiple times, re-installing the modpack, using Version 2.0.2.7 instead, bound all other keys to 'NONE' so there wouldn't be any conflicts. I even checked the Windows keyboard and accessability settings, but all to no avail.
Better description of the issue:
My sprint key works both normally, and like a toggle.
If I hit the sprint key after moving, it works how you would expect it to. However if I hit the the sprint key _before_ moving - or on accident _earlier_ than W - it toggles sprinting on. Which means whenever I move I automatically start sprinting. This is enabled until I press the Sprint key again while standing still.
Then there's the part about it working the other way around too; If I enable the sprint toggle and try to run normally, I move at normal speed instead.
EDIT: Played the pack for a bit anyways, the issue still persists.
never had thi issue need help from my comunity
I found a way to fix it! I installed a mod called ToggleSneak, made by jacob5565.
All I did was put it in the mods folder, then ingame I changed the options to make it behave like vanilla through the mods options GUI. Now sprinting works like normal again!
@Dream-Master maybe we should add this mod and set the values to restore the normal sprinting mechanics? So far I don't know if anybody has found out what causes the toggle sprint but more players are annoyed by it than people who actually like it.
GT++ is the mod that changes sprint key to toggle:
In fact, it says it borrows from ToggleSneak but the options aren't available to configure from any GUI or config.
Good job! This has irritated me for the longest time.
Hoping it gets fixed.
This bug is also causing #5142.
@draknyte1 Any updates?

2.0.8.0b using Build 394 because build 400 crash on servers.
@draknyte1 is the fix in 394?
Obviously not, as stated above.
Fixed in 2.0.8.3
Most helpful comment
@Dream-Master maybe we should add this mod and set the values to restore the normal sprinting mechanics? So far I don't know if anybody has found out what causes the toggle sprint but more players are annoyed by it than people who actually like it.