Hey guys,
Im playing ftb Revelation on 1.12. Since I'd like to start with the Flux Networks it would be essential to get some flux dust. But since throwing redstone into lava / fire doesnt work, and crusing redstone with obsidian doesnt do it either. I dont know what to do. Am I missing something or have there been some changes ?

Are you using the latest version of the mod & is the recipe disabled in the config?
Or does FTB has it's own custom recipe.

Some much older versions also dropped Flux randomly when mining Redstone Ore.
With default config options these versions below will work.
https://github.com/SonarSonic/Flux-Networks/wiki/Getting-Started#obtaining-flux