I rarely use the ACE for the Captain Sim aircraft. I set all the aircraft up once when I first install them, then I make the rest of the changes in the Aircraft > Fuel and Payload menu.

Sometimes it depends on which version of the OS that people are using. Like Windows 7 Home Premium is more strict than my Windows 7 Professional. I don't know why it is that way, but I'm always get caught out by the difference on my wife and 2 sons computers because thy all have Windows 7 Home Premium, with the UAC set at the default setting.