Hi, we encountered a cross mod problem with the Dynamic Lights mod (http://www.curse.com/mc-mods/minecraft/227874-dynamic-lights and src at https://github.com/AtomicStryk…tree/1.7.10/DynamicLights). When Fastcraft is active the lights are not updated properly. When I remove fastcraft it works like intended.
You can find the bug report at https://github.com/AtomicStryk…-minecraft-mods/issues/27 and the problem in particular here http://www.twitch.tv/fate78/v/18223719?t=30m0s (just watch a few minutes). To reproduce the error, create a new world, switch to creative, get a torch in your hand and switch to night, then dig straight down.
The light updates are not working sometimes which results in a dark screen. This seems to be more frequent when the player is moved by the environment (e. g. water streams, digging down, etc.). We are using the latest forge version 1517 and Optifine_1.7.10_HD_C. But optifine does not have any effect here, when I remove Optifine the problem is still the same. Removing Fastcraft fixes the problem but makes the game a lot slower. 