Can confirm. Happened to me and my friends yesterday. Just for a while though, as far as I could tell.

Confirmed. This seems to be due to server lag. Also happens when crafting and waiting for the new item to appear in your inventory.

Food works fine here and with pretty much everyone I've been with (or we'd been all long dead). Maybe it was a server issue.

Never happened to me but happened to pretty much all my friends so far, upvoted.

Sorry, just noticed that report as well. I just tried it with a screwdriver though so I wasn't sure if the rest of the objects were working.

The night is perfectly fine, human eyes can't see color at low light levels, as a multitude of sources on the first page of Google will tell you. Actually, they can't even see as well as you can on DayZ, since real night vision is much more blurry than the one of the game.

Just use the flashlight, that's why you spawn with one.

This happens everywhere, even through solid ground (when you're climbing a mountain, for example).