I wish this post was started earlier,i had the same problem and ended up deleting the savefile,in which i sunk 2 carriers......before i found out it had something to do with the radio mod.
So i deleted it,then removed the mods,loaded them back up again and it works,but i lost my precious 120.000 tons savefile......darnit
Time to start a new carreer,i'm in my 15th mission now,and i've been ordered to patrol the Barentz sea again...and again.....and again.....they are nice hunting grounds but maybe a little too busy as i sometimes get caught between a task force and a convoy,as soon as i attack either group i get ALL destroyers om my tail,from both convoy and task force...which is pretty exciting but timeconsuming..