Sadly that won't work for me. My monitors aren't quite the same size, so that would mean having a slightly too long minecraft window. Then again, it won't really matter in a couple of months, with Mac OS X Mavericks coming out.
I think you are right; it does only happen on external displays! I don't know why it would cause a kernel panic though, My CPU and GPU were both operating fine, and RAM usage was only at half. I've only ever had a kernel panic once, and that was when my entire system was overloaded. Any ideas/know when this is going to be fixed?
I know this has been marked as a dupe, though it is not the same. In my case, my laptop completely shuts down. I don't even have time to try to force close it, let alone get a crash report.
it is my friends vanilla snapshot server i helped him set up. It works fine on most computers, even mine sometimes, but not on certain networks, it seems.
http://www.apple.com/osx/preview/ specifically multiple displays