I'm trying some MP washing on my mage. I put 5 points into MP, but attempting to take them does nothing and make it so I can't use any skill until I use a potion. This is rather strange as I can reset points out of MP just fine on my assassin. Perhaps it's due to the interaction with Improving MaxMP Increase? I'm just wondering if anyone else has attempted to wash points out of MP on a mage, as I'd like to rescue my 5 AP from the void.
It doesn't really matter if it did him any good. He put them in, now he can't take them out, that's the problem. I think the real question is whether this was a glitch in official servers in v62, because that's certainly possible.
Every job class has a minimum level of MP below which they cannot take any points out of MP. It's possible that you were at that level. Closing thread now, as this is a player error rather than a bug.