This is a bug that is happening to other players, including me 8as can be seen in other threads in this subforum). I have no idea why but I have reported it to Joymax in the hope they fix it some day.
The case is that
the error doesn't just happen when you get a DC (that's "normal") but when we try to connect to SRO after the Euro update. We just can't connect at all: we always get that stupid error (though I can't see the fancy Korean chars

). It seems to be independent from OSs (I've seen it with Vista and W98) and graphic cards (I have NVidia) and I don't think it is direct draw related either.
I wonder if it has something to do with Athlon CPUs though, as mine is also that mark.
