Basiclly the windows foward or backwards buttons on a standard mouse make FTB goto the menu when in game.
I use those buttons for vent, as does cerebral.
When i push those buttons in FTB MC it goes to a menu.
ONLY FTB does this. Vanillia MC, TechnicLauncher MC both do not do this. so it is something in FTB.
I know i can just change my vent button, but any other key conflics with my computer useage and since this is something caused by FTB i shouldnt have to change EVERYTHING else to make it work. Im sure there is a way to change this in FTB's files if one of the developers reads this. But yeah, it is annoying, the only way i can play and use vent is if i put my vent button to backspace which is VERY disruptive to my computer useage.