Save & Load bug confirmed, it was a nice surprise when I had to save and quit during convoy assault...
Anyway, I downloaded and installed 1.4 and life seems to be nicer now
BTW, that 1.4 readme said that fixed a bug which caused destroyers sink when they collide with Subs...

I once had a DD driving directly on me when I was surfaced (little gambling with deck gun and didn't notice to look where I'm going) and only think happened I had a hole where you could fit that damn destroyer in my boat...
Happy hunting everyone