[torpedobait]

Originally Posted by CapnScurvy

The Alt/Tab keystroke is a Windows feature to allow you to leave a running program and return to desktop. The issue for SH4, its been blamed for all sorts of issues and developing problems, some unjustified.

You may think I'm for the Alt/Tab feature.....I am not!! Nowhere does the game suggest you can/should use the feature. It's not in the "Manual" or in their Keyboard Layout descriptions, so don't use it!!

To that end, I never Alt/Tab out of the game. If I wish to return to the desktop I end my game and Exit to Windows as the game provides. My point is, I too have had the Co2 bug hit and nothing stopped it from killing my crew as I tried everything I could think of to reduce the continuing buildup of Co2 in the sub. Once the Co2 begins to build, your surfaced, and the level continues to climb, your only solution is to save the game, Exit to Windows, and restart your game as Larrywb57 describes.

By the way Delfi, Welcome to SubSim!!

I'm not sure you actually have to exit all the way back to Windows. I have done the Save, and then immediately reloaded that Save Game numerous times with success. But of course going back to Win and restarting the game can't hurt if that is a preference.