I had the same problem and found the solution here: https://www.reddit.com/r/feedthebeast/comments/4zp2ku/is_it_possible_to_add_mods_to_the_1102_forge_dev/  (by brute force googling)   Go to Run/"Run Configurations ...", select in tree left "Java Application"/<Name-of-your-ProjectFolder>_Client, go to "Arguments" Tab and remove in "VM arguments" "-DFORGE_FORCE_FRAME_RECALC=true" what should be the whole content of that textfield. This stops FML/Gradle to use any mod in its d
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