Is this something that just started happening out of the blue? Do you have the latest patch? How are you enabling the mods? are you using the modlist in the launcher or are you using execution commands on the command line in the ARMA3.exe properties? and lastly, have you set all your mods outside of the ARMA folder and do a fresh install to try and start without any mods with a squeaky clean installation? We'll move from here.