Just on my server and someone is invisible and is quickly destroying the hole map.

You have to drop tactical reset on map.

I saw this as well. Someone destroyed a small wall I made out in the open but I saw nobody there.
They probably were on my team, because they didn't bother shooting me. That means they were griefing, which leads me to believe it's a hack and not a bug.

You mean random blocks disappearing? Yeah i had that happened to me once, i told everyone to say something and the only one who didn't was deuce 5, everyone votekicked and guess what? It stopped.

I'm pretty sure I know what this is, it's not so much of the person is invisible as is the person is able to move around "outside his body". I saw once on the server I play on that blocks were rapidly disappearing seemingly on their own (with the spade sound obviously), but when i switched teams i found a green that was standing above ground moving slightly while holding down the spade dig while seemingly digging nothing, we kicked him and it stopped. So it might be this if it isn't then sorry for making you waste 30 seconds reading the block of text.

Edit: and holy shit this was a week old thread so this whole thing was pretty much pointless anyway...

It is not pointless, we need to report these things so they can be fixed. Let it die and it'll keep happening. I was going to make a new post until I saw this thread.

Invisible hacker? Or extended block removal range?

No they stand still and use god like powers to machine gun(pick) the fuck out of a bunch of blocks