Alright, so I was playing at Jirue's Fort Wars, then all of a sudden my keyboard started acting weird. I don't know what happened, but now three of my arrow keys won't work, the 1, 2, and 3 on my numpad won't work, and the o, ., and ENTER won't work on my numpad either. What is going on? Jirue said this happens from time to time, and said that doing Alt+Tab will fix it, and it didn't. Then another person suggestion unplugging and then plugging my keyboard back in to my computer, that didn't work either. Now I really need help, I know my keyboard isn't broken because I've heard about many accounts of this happening. And I'm on a Mac OS X.
Please help.
tl;dr = Keyboard is acting weird, some buttons aren't working, need help.