Grand Chase closes when I switch to a window other than Grand Chase for a little bit

[Noctis]

I don't know why. Whether I just turned it on and it's loading or I'm in the middle of the game or something, if I switch to another window for more than 10 seconds, Grand Chase closes.

[Hector]

As a way to prevent hacking, it only happens in naGC though, and only for some. Q_Q?

Never encountered it on any other version I've played.

[Noctis]

If it's to counter hacking, it should happen to everyone, shouldn't it? It happens when I play on my laptop but not when I'm on my desktop.

If it's important at all, my desktop is Windows XP and my laptop is a recently purchased one so it's Windows Vista.

[Gladiat]

I have a laptop window vista as well. If you change GC out of full screen, then you can change screens. Well... that works for me at least.

[Noctis]

I already have it in windowed mode. I like to talk to ppl on Windows Messenger and I don't get alerts to new messages and stuff when I do things in full screen.