This time, the problem is different:
1) Use "Inner Shadow" (Plugin feature from BotBait)
2) Program locks at window titled "Finishing"
3) After a while, it just is resolved
Maybe I won't have to use paint.net again if this problem persists.
Usually, all of the time when i use a tool, it shows a window showing the title "Committing Changes". Sometimes it goes quick, and sometime it stays stuck at 70%. How can I fix this so I get none of this window?