If water and flowing lava collide, you get cobblestone. When sitting/non flowing lava and water collide you get obsidian. If the lava streams aren't big enough (under half a block in height i imagine) it looks like the lava just disappears instead of spawning cobblestone.
Didn't edit the page as i wanted other people to confirm this and that it's not just me.
Q: I'm trying to gather lava with a bucket, but its not working. Any tips?
A: You sure can collect it but cannot collect it again like water.
A#2: If you're trying to gather lava from a lava flow, you need to take it from its source block.
Is it 100 smelts or 128?Toadbert