Board Thread:Resolved Mod Technical Support/@comment-30108723-20161009214715/@comment-30108723-20161010085709

MilkMC wrote: JVM Flags: 7 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Xmx512M

You have two -Xmx flags remove the 512M one and you should be fine. I'm sorry but I don't know where I can remove that 512M... Where do I do that?