Just throwing out a heads-up. I updated to the latest version of java earlier today and later decided to hop on Spiral Knights on Steam for a quick run. I found that the game was completely unplayable with the screen freezing and tearing every three seconds. Did a system restore to revert the change and the game was back to normal.

Currently running on Java Version 6 Update 26 (build 1.6.0_26-b03). No trouble here.

As for the problem build...5 seconds of google did not tell me.