Skill points can go negative when you change difficulty modes in the middle of a game, and the game appears to break in the web version when you try to change skills when your points are negative (you have to wait until they are positive again). I'll fix it so it just does nothing until you are back in the positive in the next update. The executable version seems to work fine, which is why I didn't notice this before.
i little known fact about minecraft the seed 3 is a very creepy seed where some odd things happen for example this is true by the way i was mining and i came across a ravine so i went in found a random plank of oak wood and nobody else has been in it so i dog around the wood and find nothing but stone and so i told my friend to come over to where i was and he was just as shocked as i was
 "Aground"){kind=icon}
 "Mutilate-a-Doll 2"){kind=icon}
 "Diary of A Cat"){kind=icon}
 "Jade Wolf 2"){kind=icon}
 "Doodle God Blitz"){kind=icon}
 "Potion Panic"){kind=icon}
 "Mine Blocks"){kind=icon}
 "We Become What We Behold"){kind=icon}
Skill points can go negative when you change difficulty modes in the middle of a game, and the game appears to break in the web version when you try to change skills when your points are negative (you have to wait until they are positive again). I'll fix it so it just does nothing until you are back in the positive in the next update. The executable version seems to work fine, which is why I didn't notice this before.