I found several reports of that issue but no one seemed to be accurate, so sorry for the duplicate if I missed one.
The issue is this one, and has been there since 13 and the html admin console.
- the admin console has to be open in Chrome, at least on a mac
- in Pro, the function Get ( ActiveModifierKeys ) ceases to work (which you can see in the data viewer)
On a side note, I'd really like to know how this can happen. If one had wanted to do it, it would have taken him some efforts