It just does nothing.

I had fixed this once already; wonder what broke.

You always give me mysterious bugs; I added two logging statements which do nothing and now it works.

What versions of Creatio and JEI are you using?

Edit could you also post you cfg file to pastebin?

It appears to be an intermittent issue; are you getting any JEI messages in your log? Could you please post your creatio cfg file.

Creatio.cfg: https://gist.github.com/Insane96/7df721e039551765a8be0c31b66a4342
Nothing in logs

The latest beta I've uploaded to curse has some extra logging included during the JEI plugin loading phase. Would you please start your game with it and provide me the ex nihilo log.

https://gist.github.com/Insane96/f74836e08c409fb4724ffadfb50fa2d8
There's the log
Ignore the simple corn error, forgot to remove those after I removed the mod

So based on that; it is registering the TiCon style hammer as a catalyst. How many TiCon hammers do you see in JEI when it isn't working? Is it just the hammer or is the crook broken too?

Hammers are shown for every material like Tconstruct ones. Same for the crooks

That error is expected and means it is working. I wonder if the issue is the order that jei loads plugins.

Ok, seems like that sometimes all the Hammers are shown in JEI but pressing 'U' doesn't work and sometimes only the wooden one is showed and pressing 'U' works.

Also found this error checking the log when U works
https://gist.github.com/Insane96/9ed229ff7fcf8ba7d72b937a192a168e

But it's strange since sometimes it works, some other doesn't