I tried unloading several modes and it started working. I then started putting them back, all though, not in the same order. got them all back in and it is still working. other oddities: before, lost external gun; now was able to update to 5 inch and two 40s'. before, lost crew slots; now, gained crew slots. before, (actually last couple patrols), was carrying several mark 27; now, they are not offered.
schnee: may you should try loading a mode, seeing if it behaves; then removing it??
