Through process of elimination I discovered that Avast Free Antivirus’s Behavior Shield Blocks Blade and Soul’s launcher and the FTB Launcher for Minecraft. I can turn the shield off and the programs run fine but I am uneasy about having to drop an entire layer of protection and adding the affected programs to the Behavior Shield’s exclusion list has no effect whatsoever. I’m also using COMODO Firewall 10 for my firewall if that makes any difference.