About that problem I had here a while ago...:
http://forums.spiralknights.com/de/node/18680
( Includes temporary Workaround for linux / jre7 Problem )
... that turned out to be a bug in libwgl or something if I understood it right...?
http://lwjgl.org/forum/index.php/topic,4085.msg22080.html#msg22080
Well, it looks as if this has been fixed upstream by now. But SK still seems to be shipping the old / broken libraries?
I guess it is, at least I still have to use the workaround. Which is why I'm posting this issue again as a 'bug' now. Don't know what java versions are shipped with "mainstream distributions" at the Moment, but I'd guess SK could 'break' there with any update now? I'm not sure... so...
Anyway, maybe someone who knows stuff should take another short look at those things.
the LWJGL resources are packed into the code folder. The launcher can easily replace them if need be, but testing them with the existing code for side effects may take a little while.
I'm sending OOO a support ticket to draw attention to it.