Making a game engine is a major endeavor. I suggest you look at some of the game engines out there. I recommend construct: http://www.scirra.com

It's free, easy to use and has tons of features. Windows only though.

Yep. I managed to narrow it down - apparently it won't work until I deselect the bone that's selected for reasons unknown. Either way, it's working now - I guess I don't need that link after all.

Interesting - turns out it only doesn't work on one file.

It was working, but stopped for some reason. Don't know why, I didn't do anything out of the ordinary.

Tried rebooting and reinstalling, but it still doesn't work. The option in the toolbar is greyed out and pressing 't' doesn't do anything.

Translation of bones has stopped working in 5.6. Can anyone show me where I can download 5.5 again?