I have a fulling working brand new Windows 8 dell laptop with java. When I started to play Spiral Knights everything worked fine but I was unable to cut down the trees at the start of the game. My character does flashes in and out. What the heck is wrong?
You're lagging. Internet connection is so slow the server doesnt register your hits and teleports you around.
That's the best explaination that covers both of your issues.