Im Playing FTB:IE and noticed the elevator ist working, but since no one reported this issue i thought it may be caused by better sprinting and indeed it is.
I dont know what exactly is changed by the mod but probably is messes around with the sneak key which triggers the elevator. interestingly, jumping wont work, too.

In short:
Elevator doesnt work when better sprinting is installed(Neither sneaking nor jumping trigger the elevator)

Ooooh, nasty way of implementing it. Anyway, nothing I can do on my side. Fortunately, OpenBlocks has fallback mechanism.

Open OpenModsLibCore.json in config folder on client, find activate_movement_callback and change line below it from "value": "true" to "value": "false".

Or just add PlayerAPI, since it also causes OpenBlocks to use fallback.

It works fine now (I used the first possibility)
Thanks for your help.

Ok, just installed Openblocks in 1.12.2 and noticed the OpenModsLibCore.json doesn't have any option for movement callback, since there's no playerapi out for this version, I'm pretty much stuck with elevators that don't work, the ones from ElevatorMod works fine. I'm unsure if I should open a new issue here or this one will get your attention,,, For now I just disabled your elevator in the config and use the one from elevatormod.

For 1.12 it's #882 duplicate.

Report it to Better Sprinting, since it's their coremod that breaks hook supplied by Forge.

Ok then, will use the Elevator mod since it does work and will simply hope that Better Sprinting will fix this, but this problem exist for so long that I don't expect them to fix it anytime soon, 2 yrs later and they didn't change their method.

Well, in 1.7.10 it was "use third-party hook lib, which interferes with other hook", but in 1.12 it's "use homebrew coremod to break Forge functionality", so it changed from compatibility issue to rather obvious bug.

I don't understand this kind of things, just reporting what I get to help devs whenever I can, for now, I use a ported version of the Elevator and I simply disabled the one from OpenBlocks in config so it wouldn't overlap since recipe is the same, just miss the rotating elevators but I can live without them. I checked to see if a better sprinting config could help, but its rather just for controls and nothing related to this in there.

To clarify, ever since Better Sprinting (BSM) became a Forge mod, it always replaced either the entire EntityPlayerSP class, or the entire onLivingUpdate chain from EntityPlayerSP to Entity.

That was also the case with a PlayerAPI fallback, which was made to improve compatibility, but would remain incompatible with any mod that changed onLivingUpdate.

The homebrew coremod was made around 1.12 after I got tired of a long update process, and now BSM only replaces about 2/3 of onLivingUpdate instead of the whole chain, which is more compatible and has way fewer bugs than anything before it.

The issue in 1.12.2 is happening because BSM for that version came out over a month before Forge added the hook OpenBlocks uses, and I was only notified of the issue today.

Thank you for fixing that!

(For future reference: chylex/Better-Sprinting#32)