I just booted up the Explorer and they work fine for me. Maybe you can be a bit more specific about where this isn't working for you? Not saying I can help you, of course, but someone might with a little more information.
Using arrow keys for "move forward" & "move backward"

The arrow keys do NOT work anymore! I tried different browsers, all the same effect :-(
That was reported for Daily games in beta, a few days ago and is ticketed to be looked at.
The arrow keys do NOT work anymore! I tried different browsers, all the same effect :-(