I just noticed that I can write on my other msn account, but not my main one. I must have changed something on my main msn account, but it didn't effect the other one.
By the way, I have also used A-Patch v1.1.5. Could this have anything to do with it? (http://shoutbox.menthix.net/showthread.php?tid=38398&page=1)
I uninstalled everything and just installed msn. Still, my msn account doesn't have ink, but the other accounts do
/ 
