BiomesOPlenty-1.7.2-2.0.0.820-universal (but the bug has been around for a while now)

Looks like this atm:

but should look like this:

breaking a block near the lava will make it flow as intended...

also there's some air bubbles in the oceans... not sure if they're related to this, or what even causes them, but they seem very out of place ;)

PS: popping those hives is fun... I love the way the honey flows slowly like molasses :)

I used to think the non-flowing lava blocks were just in the nether, then I found this little odd ball. It looks like it flowed one block, and then stopped. It might be unrelated, but it was certainly odd.