I can add new keywords to photos but can n longer move those into an appropriate part of my key word hierarchy. As being able to effectively catalogue your photos is a key promoted feature of LR having such a basic faiure is a cncern nt to mention irritating.
Any one else experiencing and hopefully a resolution.
I have seen posts from a few years back that Adobe has some limit on number of key words - which I trust is not the case given this is a cre feature and important given the amount of screen real estate dedicated to it in teh Library module
Since you already have a hierarchy, if you collapse all but the parts you need to access at any one time, you can avoid the bug. See here for how to use the Filter Keywords box to make moving keywords much easier: