Moving to Indesign forum.
Try restoring your InDesign preferences. Here's how:
You're assuming that it's an InDesign bug that you lost your shortcuts. That is almost always a local computer glitch. None of the rest of us have that problem, we would be flooded with reports if that is true.
I hope your problem is solved by now. The same happened to me since upgrading to Mac OX 10.11/El Capitan and InDesign CS6. Now I have opened the "keyboard shortcuts"-configuration from the edit menu. There I went to the tool (or toolbar? I use a german language version…) section, scrolled way on down to the "hand"-entry and added the shortcut "space".
Voilà, it works again.
All the best!