Sometimes when I click the buttons on the right side bar, the window doesn't open, for example the magic lamp window. I don't know if it's because I have 2 monitors and I keep changing my l2 game between them and they go away from screen bounds. Spamming the reset windows location sometimes fix it.
1. close game client 2. delete file WindowsInfo.ini in the client's /system folder 3. try in-game again if you want to report this bug, please go to https://eu.4gamesupport.com