There, white lava. This time there was also green lava, which came out in a bubble from the bottom and mixed with the white lava to make yellow lava.
You guys didn't see any of this?
Okay, that is a bug :< Possibly to do with your graphics card.. I am not entirely sure how to fix that. The lava itself calculated graphically so I'm not entirely sure why that is happening.
What graphics card to you have? If I can replicate the bug on someone else's machine it would be easier to fix. Also what res are you running your screen, etc.
About the bug where lava "escapes" the map, I know what's causing that and may be able to fix it. Bear with me, I'll release a patch really soon.