I read other threads about option-drag and shift constrain not working. I wonder if anyone at Adobe can fix this. I read someone closed their browser -- that does not work for me. I tried with Chrome and Safari.
I also am not sure what someone's "update your driver" advice means -- indulge my ignorance.
Any developments from Adobe? It is really slowing down my work. Thanks!
I'm experiencing the same problem.
Was fine last week (7/17/2015) but is no longer working.
I've downloaded latest versions, is working in illustrator, i've tried closing all my browsers.
Problems with modifier keys not working almost always are caused by (1) third-party software grabbing keystrokes, (2) browser extensions, (3) conflicting system keyboard shortcuts. Try restarting your computer, and launch InDesign first before loading other software and see if the modifier keys work again.
If that doesn't work, create a new user and test in a new user. If it works there, there's something wrong in your current user.