No, the not responding one, where it says Java something or the other has stopped responding, restart or wait for it to start responding again XD. Some times it has this error a bit like the ogre exceptions here, where java can't find some file or the other and I have to close and reopen it to get it to work.
It gets on my nerves, and the amount of lag i have *sigh* But that's what happens when you play minecraft and lots of mods on a little laptop. But it still works fine most of the time, but on some occasions the lag gets so bad that I just have to close it.