Those who have FSX, please to add to this list.
Problem: Some aircraft seem to only have a 2D cockpit when cycling through the views.
Answer: press F9 for 3D virtual cockpit
Problem: I have to minimise FSX after every print screen I take for a screenshot.
Answer: Press V to take a screenshot. This will be saved in a .bmp format into My Documents>My Pictures>Flight Simulator X Files. You can then look at them and post them on here at your own leisure.