Preferences Screen:
Easy mode switch is working inverted. If you deselect it (green light off) you play on easy (lots of ammo and triangles for submerged subs on 500m screen) and if you select it (green light on) on difficult.
Mission related bugs:
German Missions
Surface Global:
After finishing all missions but 10a I got promoted to Fregattenkapit?n. Now I always spawn a Z35 DD (whose new model I love btw
Mission 10a:
The Prince Edward and the Hood seem to be indestructable, or they don't shoot at each other enough.
I had them firing at each other at ~500 Meters (me being about 8km away from them) for like 30 minutes and nothing happened, I then went away and after 30 more minutes I had a blank radar screen but still didn't "win".
What I didn't try out yet is having visible contact with the Hood (getting the "this looks familiar" message from my XO) and then running away
Submarine Campaign:
Mission 3: (Bren incident)
The "the americans have broken up" message always appears directly after the LFN Sub fires its torpedos.
The Mission is generally poorly "documented", after the Bren is it the player doesn't know what to do and can only finish the mission by trial and error.
Those are all the bugs I found so far.