Source blocks of water and lava that generate in ravines, on the sides of mountains, and in caves don't flow down until an adjacent block is updated. Here is my WorldConfig: http://pastebin.com/sNrmvfEt The main settings I've changed are the ones for ravines. Running the latest dev build of TC and the latest version of Spigot 1.11 (git-Spigot-16c940b-691628a).

I reported the same issue in the forums... Forum Post.

Relevant Info:
"I was using build 169 when I took the screenshot with no other plugins installed. I tried without Terrain Control and this doesn't happen."

"I tested builds 165 and 169 with a completely new install of Spigot 1.11 and 1.11.2 and it was still occurring. When I drop down to build 164 and Spigot 1.10.2 it no longer happens."

Having the same issue.

I made a plugin that works as a temporary workaround for this issue. https://dl.dropboxusercontent.com/u/80254350/LiquidTick.jar
It will automatically update chunks once when they are loaded and keeps a list of the chunks it has updated, but you can also update a chunk manually by standing in it and typing /lup (must be opped). Note that it only updates blocks of liquid with no neighboring liquid blocks (which accounts for most occurrences of this issue). Feel free to decompile it and edit it to your liking.

Hey, I'm having the same problem. Would anyone mind throwing that plugin my way? Link seems to be dead.

@FoxLGV Sorry about that. https://www.dropbox.com/s/5340ty1ezhegj84/LiquidTick.jar?dl=0

This is an issue again as of 1.12, minecraft:flowing_lava is stationary.