Whenever I attempt to open up a modpack, it begins to load, then once the loading process finishes, the launcher quickly flashes on and off of the screen but doesn't open up the game.
I opened the console and in it, I found that it said this after it failed to open:
"Error occurred during initialization of VM
[B#347] Initial heap size set to a larger value than the maximum heap size
[B#347] Picked up _JAVA_OPTIONS: -Xmx256M"
I've never had this problem before and I'm not sure what's causing it. I'm able to run vanilla Minecraft outside of the launcher, but not inside of the launcher.