I thought there was a well-known problem with some of the higher numbered function keys being disabled when you do certain changes to the screen resolution. I've never changed my resolution so I don't have any direct experience.
Here's a quote from the documents for the Silent Hunter 3 profile for Shoot 1.6.4 voice command:
Quote:
Symptom: I’m using dx9res10 to change my game resolution and I can’t take a screen shot or make an animation
Solution: Unfortunately, these two functions, CTRL F11 and SHIFT F11 are disabled when using dx9res10, along with F9 and F10 and any CTRL/SHIFT combination with these keys. These functions are hard coded into the game, and cannot be remapped. Sorry.
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The above is likely outdated, as there are workarounds, as you've found by swapping the emergency surface command. But the problem with the function keys remains, and several people have commented on it.
For example:
http://www.subsim.com/radioroom/show...0&postcount=20
Hook